SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    ________

                                    FORM 6-K

                        REPORT OF FOREIGN PRIVATE ISSUER
                      PURSUANT TO RULE 13a-16 OR 15d-16 OF
                      THE SECURITIES EXCHANGE ACT OF 1934
                          For the month of July, 2004

                                  Serono S.A.
                      -----------------------------------
                              (Registrant's Name)

                            15 bis, Chemin des Mines
                                Case Postale 54
                                CH-1211 Geneva 20
                                  Switzerland
                      -----------------------------------
                    (Address of Principal Executive Offices)

                                    1-15096
                      -----------------------------------
                              (Commission File No.)

     (Indicate  by  check  mark whether the registrant files or will file annual
reports  under  cover  of  Form  20-F  or  Form  40-F.)

     Form  20-F  X  Form  40-F
                ---           ---

     (Indicate  by  check  mark  if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101 (b)(1).) ______

     (Indicate  by  check  mark  if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101 (b)(7).) ______

     (Indicate  by  check  mark  whether  the  registrant  by  furnishing  the
information contained in this form is also thereby furnishing the information to
the  Commission  pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.)

     Yes      No  X
         ---     ---

     (If  "Yes"  is  marked,  indicate  below  the  file  number assigned to the
registrant in connection with Rule 12g3-2(b): 82-______)



                                                                          SERONO


Media Release

FOR RELEASE JULY 21, 2004, 4:01 pm ET
-------------------------------------


--------------------------------------------------------------------------------

              STRONG SECOND QUARTER WITH ROBUST EPS GROWTH OF 28.5%

            - SIGNIFICANT REVENUE GROWTH AND GROSS MARGIN IMPROVEMENT
                     PROPEL NET PROFIT UP 26.0% TO $135.8M -

--------------------------------------------------------------------------------


ROCKLAND,  MA, JULY 21, 2004 - 04:01 PM ET - Serono (virt-x: SEO and NYSE: SRA),
the  world's  third  largest  biotechnology  company,  today reported its second
quarter  results  for  the  period  ended  June  30,  2004.

KEY POINTS FOR SECOND QUARTER 2004

     -    Total revenues up 15.6% to $587.6m (up 11.2% in local currencies)

     -    Product sales up 15.2% to $538.6m (up 10.6% in local currencies)

     -    Gross margin of 86.6% of product sales

     -    Net income up 26.0% to $135.8m (up 21.5% in local currencies)

     -    Basic EPS up 28.5% to $8.75 per bearer share and $0.22 per ADS

     -    Significant expansion in Rebif(R)'s global sales and marketing
          activities initiated

     -    Unanimous positive opinion from the CHMP recommending approval of
          Raptiva(R) in the EU

     -    Phase III study of Serostim(R) in HARS initiated

"Our second quarter results are excellent with strong EPS growth of 28.5%," said
Ernesto  Bertarelli, Chief Executive Officer of Serono.  "I am very pleased with
the  recent  recommendation  for  Raptiva(R) made by the scientific committee of
Europe's  regulatory  agency  (CHMP).  Raptiva(R)  will  further  diversify  our
product  portfolio  and  contribute  to  our  future  growth."


                                     -more-

SECOND QUARTER FINANCIAL PERFORMANCE

Total  revenues  increased by 15.6% to $587.6m in the second quarter of 2004 (Q2
2003:  $508.4m),  or  11.2%  in  local  currencies.  Sales  of marketed products
climbed  15.2%  to  $538.6m  (Q2  2003:  $467.4m), or 10.6% in local currencies,
despite  the  continued  tightening  of the pricing and reimbursement climate in
some  European  countries.  Royalty  and  license  income  increased by 19.4% to
$49.0m  (Q2  2003:  $41.0m)  primarily due to higher sales by various licensees.

Gross  margin  increased to 86.6% of product sales (Q2 2003: 84.8%), as a result
of  the  improvement  of  product  mix  and  continued  productivity  gains.

Selling,  General  and  Administrative  expenses  were $193.1m or 32.9% of total
revenues  (Q2  2003: $158.1m or 31.1% of total revenues).  The relative increase
in  SG&A  as  a  percentage  of  revenues reflects the investment in promotional
activities  for  the  Gonal-f(R)  prefilled pen, as well as pre-launch costs for
Raptiva(R).  Research  and  Development  expenses were $123.2m or 21.0% of total
revenues  (Q2  2003:  $108.5m  or  21.3%  of  total  revenues).  Other operating
expenses  were  $53.7m  (Q2  2003:  $50.9m).

Operating  income  increased  by 21.2% to $145.5m or 24.8% of total revenues (Q2
2003:  $120.0m  or  23.6% of total revenues) and net financial income was $15.3m
(Q2 2003: $12.8m), benefiting from foreign exchange hedging gains as a result of
the  strengthening  of  the  Swiss  franc  against  the  Euro.

Total  taxes  were  $25.7m,  representing an overall tax rate of 16.0% of profit
before  tax  (Q2  2003:  $20.6m,  or  16.0%  of  profit  before  tax).

Reported  net  income  jumped  26.0%  to $135.8m (Q2 2003: $107.7m), or 21.5% in
local  currencies.  Basic  earnings  per  share (EPS) were up 28.5% to $8.75 per
bearer  share (Q2 2003: $6.81) and $0.22 per American Depositary Share (ADS) (Q2
2003:  $0.17).

For  the  first  six  months, net cash flows from operating activities increased
36.1%  to  $252.1m  (H1  2003:  $185.2m).

On  May  25, 2004, a new share buy-back program was authorized for up to CHF 750
million,  and  following  regulatory approval this program started in June 2004.
The  shares are purchased on the open market via a second trading line (security
code  SEOE),  and  will  be  subsequently  cancelled.

As  of June 30, 2004, there were 16,140,341 outstanding equivalent bearer shares
of Serono S.A. including 708,271 treasury shares available for general corporate
purposes.


                                     -more-

NEUROLOGY

Given the multiple sclerosis market's significant growth potential, coupled with
Rebif(R)'s  long-term  efficacy  and  unsurpassed ability to significantly delay
accumulation  of  disability, Serono believes there is an opportunity to further
grow Rebif(R)'s share.  Serono is therefore increasing the size of its sales and
medical  teams,  as  well as introducing new field nurse programs, and extending
call  centers  to  many  countries,  to  further  support  Rebif(R)  patients.

In the second quarter, neurology sales were $266.2m (Q2 2003: $205.5m), up 29.5%
or  23.6%  in local currencies.  Sales of Rebif(R) were up 29.2% (23.1% in local
currencies)  to  $257.1m  (Q2  2003:  $199.0m)  and  Novantrone(R)  sales  in MS
increased  by  39.3%  to  $9.1m  (Q2  2003:  $6.6m).

In  the  US,  sales of Rebif(R) jumped 65.0% to $69.6m in the second quarter (Q2
2003:  $42.2m).  Rebif(R)  is market leader outside the US with sales increasing
by  19.6%  to  $187.5m  (Q2  2003:  $156.8m),  or  12.3%  in  local  currencies.

Serono  continues  to  lead  the  way  in  developing patient-friendly injection
devices,  with  advanced  functionality.  In  May,  the  new  Rebiject  II(TM)
auto-injector  was  launched.  This  device  is  specifically  designed  to make
self-injection  of  Rebif(R)  more  convenient  for multiple sclerosis patients.

REPRODUCTIVE HEALTH

Sales  of  Gonal-f(R)  rose  in  the  second  quarter  by  8.1%  (4.0%  in local
currencies)  to  $150.9m  (Q2 2003: $139.6m).  Serono's core reproductive health
portfolio  consisting  of  three  recombinant  hormones  (Gonal-f(R),
Ovidrel(R)/Ovitrelle(R),  Luveris(R))  and  two  complementary  products
(Cetrotide(R),  Crinone(R))  grew  by 8.2% (4.0% in local currencies) to $168.6m
(Q2  2003:  $155.9m).

The  phase-out  of  urine-derived products was completed in Europe by the end of
2003,  and in the United States this quarter.  By the end of 2004, the phase-out
of  these  products  will  be completed on a global basis, except in Japan where
recombinant  gonadotropins  are  not  yet  approved.

In  May,  the  FDA approved the Gonal-f(R) prefilled pen, a ready-to-use pen for
the  treatment of infertility.  The Gonal-f(R) prefilled pen, which combines the
efficacy of the most consistent FSH with enhanced accuracy of dosing, is already
available  in  many  European  countries  as  well  as in Australia, and will be
introduced  in  the  US shortly.  Serono recently announced that in a phase IIIb
study  that  compared the Gonal-f(R) prefilled pen with another pen available on
the  market,  twice  as  many  of  the treated patients preferred the Gonal-f(R)
prefilled  pen, as it required less time for training, less time and fewer steps
to  prepare  a daily injection and also gives patients more confidence that they
have  injected  the  right  dose  of  FSH.


                                     -more-

METABOLIC ENDOCRINOLOGY

In  the  second  quarter,  Saizen(R)  sales  increased  by  12.7% (7.4% in local
currencies)  to  $44.2m  (Q2  2003:  $39.2m).  Serostim(R)  sales continue to be
stable  at  $21.5m  (Q2  2003:  $23.0m).  Sales  of  Serono's recombinant growth
hormone  products  rose  by  5.8%  to  $65.8m  (Q2  2003:  $62.2m).

During  the  second quarter Serono submitted an application for a new indication
for  Saizen(R) in the treatment of growth disturbance in children born small for
gestational  age  to the health authorities in Europe, and the regulatory review
has  commenced.

DERMATOLOGY

On  June  23rd, Raptiva(R) (efalizumab) was granted a unanimous positive opinion
from  the  Committee  of  Medicinal  Products  for Human Use (CHMP) recommending
approval.  Serono  expects  the  European  Commission's  Marketing Authorisation
during the third quarter of this year, which would give Raptiva(R) a first mover
advantage.  Raptiva(R) will be launched in some EU countries shortly thereafter.

Serono  received  approval  for  Raptiva(R)  in  moderate-to-severe psoriasis in
Switzerland  in  March  and  in  Argentina  in  May,  as  well  as  a  positive
recommendation  in Australia.  Outcomes of marketing applications in a number of
other territories for which Serono is responsible are awaited and launch in some
of  these  countries  will  take  place  by  the  end  of  the  year.

REGIONAL SALES

North  American  sales  grew  by  21.0%  to $208.8m (Q2 2003: $172.5m).  Despite
pricing and reimbursement pressures notably in Germany, European sales increased
by  8.5%  (0.2% in local currencies) to $215.6m (Q2 2003: $198.7m).  In the rest
of  the  world,  sales  grew by 18.9% (15.4% in local currencies) to $114.3m (Q2
2003:  $96.2m).

R&D NEWS

On  May  1st,  results  from  the  CLEAR  trial,  the  first  randomized
placebo-controlled  study  with  Raptiva(R)  conducted  outside  of the US, were
presented  at the EADV (European Academy of Dermatology and Venerology) Congress
in  Budapest.  The  results  of  CLEAR  demonstrate  that  Raptiva  is  safe and
efficacious  in patients whose psoriasis cannot be controlled by, are intolerant
to  or are contraindicated to other currently available systemic therapies.  The
results in these high need patients were also consistent with the results in the
broader  moderate-to-severe  population.


                                     -more-

On  May  4th,  4SC  and  Serono entered into an exclusive worldwide agreement to
develop  and commercialize 4SC's program of dihydroorotate dehydrogenase (DHODH)
inhibitors.  This  series  consists  of small molecules with potential as orally
active  treatments  in  autoimmune  disorders,  such as rheumatoid arthritis and
multiple  sclerosis  and includes a lead compound, which is currently completing
Phase  I.

In  June,  Serono  announced  the  start  of a Phase III trial of Serostim(R) in
HIV-associated  adipose  redistribution  syndrome (HARS).  HARS is a potentially
debilitating  medical  condition experienced by people being treated for HIV for
which  there  is  currently  no  medical  treatment.


                                      ***


                                     -more-

CONFERENCE CALL AND WEBCAST

Serono  will  hold  a  conference  call on July 22nd, 2004, starting at 10:00 am
Eastern Time (4:00 pm Central European Time) during which Serono Management will
present  the  Company's  Second  Quarter  2004  Results.  To  join the telephone
conference  please  dial  412  858  4600  (from  the  US),  091  610  5600 (from
Switzerland),  0207 107 0611 (from the UK) and +41 91 610 5600 (from elsewhere).
Telephone  playback  will  be  available  one hour after the conference call and
until  close  of business 6:00 pm ET on July 30th, 2004. To access this playback
please  dial  the  following  numbers:  412 317 0088 (from the US), 091 612 4330
(from  Switzerland),  0207  866  4300  (from  the  UK) and +41 91 612 4330 (from
elsewhere)  and  enter  the  PIN  code  483#  from  a  touch  tone  telephone.

The  event  will  also be relayed by live audio webcast which interested parties
may  access  via  Serono's  Corporate  home  page, www.serono.com. A link to the
webcast  will  be  provided  immediately  prior  to  the  event.

                                       ###

Some  of  the  statements  in  this  press  release  are  forward  looking. Such
statements  are inherently subject to known and unknown risks, uncertainties and
other  factors  that  may  cause  actual results, performance or achievements of
Serono  and  affiliates  to  be  materially  different  from  those  expected or
anticipated  in  the  forward-looking statements. Forward-looking statements are
based on Serono's current expectations and assumptions, which may be affected by
a  number  of  factors, including those discussed in this press release and more
fully  described  in  Serono's  Annual  Report  on Form 20-F filed with the U.S.
Securities  and Exchange Commission on March 25, 2004. These factors include any
failure  or  delay  in  Serono's ability to develop new products, any failure to
receive  anticipated  regulatory  approvals,  any  problems  in  commercializing
current  products  as  a  result of competition or other factors, our ability to
obtain  reimbursement  coverage  for  our  products,  and government regulations
limiting  our  ability  to  sell  our  products. Serono has no responsibility to
update the forward-looking statements contained in this press release to reflect
events  or  circumstances  occurring  after  the  date  of  this  press release.

                                       ###

ABOUT SERONO

Serono  is  a  global  biotechnology leader. The Company has eight biotechnology
products,  Rebif(R),  Gonal-F(R),  Luveris(R),  Ovidrel(R)/Ovitrelle(R),
Serostim(R),  Saizen(R), Zorbtive(TM) and Raptiva(R) (Luveris(R) is not approved
in  the  USA).  In  addition  to  being the world leader in reproductive health,
Serono  has  strong market positions in neurology, metabolism and growth and has
recently entered the psoriasis area. The Company's research programs are focused
on  growing  these  businesses  and  on  establishing  new  therapeutic  areas.
Currently,  there  are  approximately  30  ongoing  development  projects.

In  2003,  Serono  achieved  worldwide revenues of US$2,018.6 million, and a net
income  of  US$390.0 million, making it the third largest biotech company in the
world. Its products are sold in over 90 countries. Bearer shares of Serono S.A.,
the  holding company, are traded on the virt-x (SEO) and its American Depositary
Shares  are  traded  on  the  New  York  Stock  Exchange  (SRA).


                                    - more -

BACKGROUND MATERIAL

For  free  B-roll, video and other content about Serono, please visit the Serono
Media Center www.thenewsmarket.com/Serono. You can download print-quality images
             ----------------------------
and  receive  broadcast-standard  video  digitally  or  by  tape from this site.
Registration  and  video  is  free  to  the  media.


FOR MORE INFORMATION, PLEASE CONTACT:

SERONO IN GENEVA, SWITZERLAND:
MEDIA RELATIONS:                INVESTOR RELATIONS:
Tel:  +41-22-739 36 00          Tel:  +41-22-739 36 01
Fax:  +41-22-739 30 85          Fax:  +41-22-739 30 22
http://www.serono.com           Reuters: SEO.VX / SRA
---------------------           Bloomberg: SEO VX / SRA US

SERONO, INC., ROCKLAND, MA
MEDIA RELATIONS:                INVESTOR RELATIONS:
Tel.   +1 781 681 2340          Tel.   +1 781 681 2552
Fax:  +1 781 681 2935           Fax:  +1 781 681 2912
http://www.seronousa.com
------------------------




On the following pages, there are:

     -    Tables  detailing  sales  in  dollars  by therapeutic area, geographic
          region  and  the top 10 products for the 3 and 6 months ended June 30,
          2004  and  2003.
     -    Consolidated  statements  of  income for the 3 and 6 months ended June
          30, 2004 and 2003; the consolidated balance sheets as of June 30, 2004
          and  December  31,  2003;  the consolidated statements of equity as of
          June  30, 2004 and 2003; the consolidated statements of cash flows for
          the  6  months  ended  June  30,  2004  and  2003;  and  the  selected
          explanatory  notes  to the interim consolidated financials statements.
          These  consolidated  financial  statements  have  been prepared on the
          basis  of  International  Financial  Reporting  Standards.





                              SALES BY THERAPEUTIC AREA
                              -------------------------

                            THREE MONTHS ENDED                  THREE MONTHS ENDED
                              JUNE 30, 2004                       June 30, 2003

                          $MILLION  % OF SALES   % CHANGE $    $MILLION   % OF SALES
-------------------------------------------------------------------------------------
                                                           
Neurology                    266.2        49.4%       29.5%        205.5        44.0%
Reproductive Health          180.8        33.6%       (1.4%)       183.4        39.2%
Growth & Metabolism           65.8        12.2%        5.8%         62.2        13.3%
Others                        25.8         4.8%       57.8%         16.4         3.5%

-------------------------------------------------------------------------------------
Total sales (US$ million) $ 538.60         100%       15.20%  $   467.40         100%





                               SALES BY GEOGRAPHIC REGION
                               --------------------------

                             THREE MONTHS ENDED                   THREE MONTHS ENDED
                               JUNE 30, 2004                        JUNE 30, 2003

                           $MILLION   % OF SALES   % CHANGE $    $MILLION   % OF SALES
---------------------------------------------------------------------------------------
                                                             
Europe                         215.6        40.0%         8.5%       198.7        42.5%
North America                  208.8        38.8%        21.0%       172.5        36.9%
Latin America                   28.7         5.3%        12.6%        25.5         5.5%
Others                          85.6        15.9%        21.1%        70.7        15.1%

---------------------------------------------------------------------------------------
Total sales (US$ million) $    538.6         100%        15.2%  $    467.4         100%





                             SALES BY THERAPEUTIC AREA
                             -------------------------

                            SIX MONTHS ENDED                   SIX MONTHS ENDED
                              JUNE 30, 2004                      JUNE 30, 2003

                          $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
-----------------------------------------------------------------------------------
                                                         
Neurology                    531.7        50.4%        37.8%     385.9        44.1%
Reproductive Health          351.0        33.3%         2.0%     344.0        39.3%
Growth & Metabolism          128.0        12.1%        11.0%     115.2        13.2%
Others                        44.6         4.2%        48.3%      30.1         3.4%

-----------------------------------------------------------------------------------
Total sales (US$ million) $1'055.3         100%        20.6%  $  875.2         100%





                             SALES BY GEOGRAPHIC REGION

                            SIX MONTHS ENDED                    SIX MONTHS ENDED
                              JUNE 30, 2004                       JUNE 30, 2003

                          $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
-----------------------------------------------------------------------------------
                                                         
Europe                       446.0        42.3%        17.3%     380.3        43.4%
North America                389.3        36.9%        21.0%     321.7        36.8%
Latin America                 55.1         5.2%        34.4%      41.0         4.7%
Others                       165.1        15.6%        24.8%     132.3        15.1%

-----------------------------------------------------------------------------------
Total sales (US$ million) $1'055.3         100%        20.6%  $  875.2         100%






==========================================================================================
                                      TOP TEN PRODUCTS
==========================================================================================

                                THREE MONTHS ENDED                    THREE MONTHS ENDED
                                  JUNE 30, 2004                         JUNE 30, 2003
                             -------------------------------------------------------------

                   * TA       $MILLION   % OF SALES   % CHANGE $    $MILLION   % OF SALES
                                                             

Rebif(R)        MS                257.1        47.7%        29.2%       199.0        42.6%
Gonal-f(R)      RH                150.9        28.0%         8.1%       139.6        29.9%
Saizen(R)       Growth             44.2         8.2%        12.7%        39.2         8.4%
Novantrone(R)   MS/Oncology        23.6         4.4%        51.6%        15.6         3.3%
Serostim(R)     Wasting            21.5         4.0%       (6.6%)        23.0         4.9%
Cetrotide(R)    RH                  6.4         1.2%         9.4%         5.9         1.3%
Crinone(R)      RH                  4.5         0.8%       (4.5%)         4.8         1.0%
Metrodin-HP(R)  RH                  4.5         0.8%      (37.8%)         7.2         1.5%
Ovidrel(R)      RH                  4.4         0.8%        30.3%         3.3         0.7%
Stilamin(R)     Other               4.1         0.8%       (6.3%)         4.3         0.9%

                                SIX MONTHS ENDED                      SIX MONTHS ENDED
                                  JUNE 30, 2004                        JUNE 30, 2003
                             -------------------------------------------------------------

                   * TA      $  MILLION  % OF SALES   % CHANGE $   $  MILLION  % OF SALES

Rebif(R)        MS                516.7        49.0%        38.1%       374.2        42.8%
Gonal-F(R)      RH                288.3        27.3%        10.2%       261.6        29.9%
Saizen(R)       Growth             84.8         8.0%        17.3%        72.3         8.3%
Serostim(R)     Wasting            43.0         4.1%         0.2%        42.9         4.9%
Novantrone(R)   MS/Oncology        38.9         3.7%        36.8%        28.4         3.2%
Cetrotide(R)    RH                 12.7         1.2%        10.9%        11.5         1.3%
Pergonal(R)     RH                  9.5         0.9%      (57.4%)        22.2         2.5%
Crinone(R)      RH                  9.0         0.9%       (2.4%)         9.2         1.1%
Ovidrel(R)      RH                  8.3         0.8%        45.4%         5.7         0.6%
Stilamin(R)     Other               8.2         0.8%         7.2%         7.6         0.9%



                              * THERAPEUTIC AREAS
              RH = Reproductive Health        Wasting = AIDS Wasting
              MS = Multiple Sclerosis         Growth = Growth Retardation
        Oncology = Oncology


                                     -more-



Consolidated Income Statements


SIX MONTHS ENDED JUNE 30                      2004 *      % OF                 2003 *     % of
                                             US$'000    REVENUES   % change   US$'000   Revenues
                                                                         

Revenues
Product sales                               1'055'335                  20.6%  875'200
Royalty and license income                     89'360                  18.1%   75'633
-------------------------------------------------------------------------------------------------
TOTAL REVENUES                              1'144'695      100.0%      20.4%  950'833      100.0%
-------------------------------------------------------------------------------------------------
Operating Expenses
Cost of product sales                         147'851                  10.8%  133'448
% of Sales                                       14.0%                           15.2%
Selling, general and administrative           377'253       33.0%      26.2%  299'040       31.5%
Research and development                      249'379       21.8%       5.5%  236'469       24.9%
Other operating expense, net                  108'577        9.5%      12.3%   96'699       10.2%
-------------------------------------------------------------------------------------------------
Total Operating Expenses                      883'060       77.1%      15.3%  765'656       80.5%
-------------------------------------------------------------------------------------------------
OPERATING INCOME                              261'635       22.9%      41.3%  185'177       19.5%
-------------------------------------------------------------------------------------------------
Financial income, net                          24'380                  25.5%   19'428
Other income/(expense), net                        64                          (3'657)
-------------------------------------------------------------------------------------------------
Total Non Operating Income, Net                24'444                          15'771
-------------------------------------------------------------------------------------------------
Income Before Taxes and Minority Interests    286'079       25.0%      42.4%  200'948       21.1%
Taxes                                          45'772                          32'151
-------------------------------------------------------------------------------------------------
Income Before Minority Interests              240'307                         168'797
Minority interests                             (1'611)                            901
-------------------------------------------------------------------------------------------------
NET INCOME                                    241'918       21.1%      44.1%  167'896       17.7%
-------------------------------------------------------------------------------------------------


* Unaudited





                                              2004   2003   % CHANGE
                                                   

Basic Earnings per Share (in U.S. dollars)
--------------------------------------------------------------------
- Bearer shares                               15.46  10.60     45.8%
--------------------------------------------------------------------
- Registered shares                            6.18   4.24     45.8%
--------------------------------------------------------------------
- American depositary shares                   0.39   0.27     45.8%
--------------------------------------------------------------------

Diluted Earnings per Share (in U.S. dollars)
--------------------------------------------------------------------
- Bearer shares                               15.43  10.59     45.7%
--------------------------------------------------------------------
- Registered shares                            6.17   4.24     45.7%
--------------------------------------------------------------------
- American depositary shares                   0.39   0.26     45.7%
--------------------------------------------------------------------


Basic earnings per share are calculated in accordance with IAS 33 (Earnings per
Share) by dividing the net income of the group, US$241.9 million (2003 US$167.9
million), by an appropriate number of shares. This is 11,240,537 bearer shares
(2003 11,431,665) and 11,013,040 registered shares (2003 11,013,040). The total
weighted average equivalent number of bearer shares is 15,645,753 (2003
15,836,881) for the six months ended June 30, 2004. As each American depositary
share represents ownership interest in one fortieth of a bearer share, basic and
diluted earnings per American depositary share is calculated as one fortieth of
the earnings per bearer share.

For diluted earnings per share, the total number of bearer shares is adjusted to
assume conversion of all in the money share options granted to employees and
directors and does not take into consideration the impact of the convertible
bond because it is anti-dilutive. The number of bearer shares used to calculate
diluted earnings per share is 11,270,640 (2003 11,445,711).


                                     -more-



CONSOLIDATED INCOME STATEMENTS


THREE MONTHS ENDED JUNE 30                   2004 *     %  OF                2003 *     %  of
                                            US$'000   REVENUES   % CHANGE   US$'000   Revenues
                                                                       

Revenues
Product sales                               538'622                  15.2%  467'414
Royalty and license income                   48'981                  19.4%   41'013
-----------------------------------------------------------------------------------------------
TOTAL REVENUES                              587'603      100.0%      15.6%  508'427      100.0%
-----------------------------------------------------------------------------------------------
Operating Expenses
Cost of product sales                        72'182                   1.9%   70'817
% of Sales                                     13.4%                           15.2%
Selling, general and administrative         193'050       32.9%      22.1%  158'124       31.1%
Research and development                    123'180       21.0%      13.5%  108'532       21.3%
Other operating expense, net                 53'705        9.1%       5.4%   50'948       10.0%
-----------------------------------------------------------------------------------------------
Total Operating Expenses                    442'117       75.2%      13.8%  388'421       76.4%
-----------------------------------------------------------------------------------------------
OPERATING INCOME                            145'486       24.8%      21.2%  120'006       23.6%
-----------------------------------------------------------------------------------------------
Financial income, net                        15'346                  20.2%   12'771
Other income/(expense), net                      60                          (3'883)
-----------------------------------------------------------------------------------------------
Total Non Operating Income, Net              15'406                           8'888
-----------------------------------------------------------------------------------------------
Income Before Taxes and Minority Interests  160'892       27.4%      24.8%  128'894       25.4%
Taxes                                        25'741                          20'622
-----------------------------------------------------------------------------------------------
Income Before Minority Interests            135'151                         108'272
Minority interests                             (637)                            534
-----------------------------------------------------------------------------------------------
NET INCOME                                  135'788       23.1%      26.0%  107'738       21.2%
-----------------------------------------------------------------------------------------------


* Unaudited





                                              2004  2003  % CHANGE
                                                 


Basic Earnings per Share (in U.S. dollars)
------------------------------------------------------------------
- Bearer shares                               8.75  6.81     28.5%
------------------------------------------------------------------
- Registered shares                           3.50  2.72     28.5%
------------------------------------------------------------------
- American depositary shares                  0.22  0.17     28.5%
------------------------------------------------------------------

Diluted Earnings per Share (in U.S. dollars)
------------------------------------------------------------------
- Bearer shares                               8.71  6.80     28.2%
------------------------------------------------------------------
- Registered shares                           3.49  2.72     28.2%
------------------------------------------------------------------
- American depositary shares                  0.22  0.17     28.2%
------------------------------------------------------------------


Basic earnings per share are calculated in accordance with IAS 33 (Earnings per
Share) by dividing the net income of the group, US$135.8 million (2003 US$107.7
million), by an appropriate number of shares. This is 11,112,539 bearer shares
(2003 11,419,355) and 11,013,040 registered shares (2003 11,013,040). The total
weighted average equivalent number of bearer shares is 15,517,755 (2003
15,824,571) for the three months ended June 30, 2004. As each American
depositary share represents ownership interest in one fortieth of a bearer
share, basic and diluted earnings per American depositary share is calculated as
one fortieth of the earnings per bearer share.

For diluted earnings per share, the total number of bearer shares is adjusted to
assume conversion of all in the money share options granted to employees and
directors and also the impact of the convertible bond as it is dilutive. The
number of bearer shares used to calculate diluted earnings per share is
11,561,817 (2003 11,440,499).


                                     -more-



CONSOLIDATED BALANCE SHEETS


AS OF                                                           JUNE 30, 2004 *   December 31, 2003
                                                                        US$'000             US$'000
                                                                            

ASSETS
Current Assets
Cash and cash equivalents                                               338'959           1'003'972
Short-term financial assets                                             800'791             434'810
Trade accounts receivable                                               333'539             318'388
Inventories                                                             278'855             319'820
Prepaid expenses and other current assets                               230'761             220'334
----------------------------------------------------------------------------------------------------
Total Current Assets                                                  1'982'905           2'297'324
----------------------------------------------------------------------------------------------------

Non-Current Assets
Property, plant and equipment                                           698'416             701'453
Long-term financial assets                                            1'243'297           1'104'333
Intangible assets                                                       254'012             259'626
Deferred tax assets                                                     169'801             169'693
Other long-term assets                                                   36'541              39'174
----------------------------------------------------------------------------------------------------
Total Non-Current Assets                                              2'402'067           2'274'279
----------------------------------------------------------------------------------------------------
TOTAL ASSETS                                                          4'384'972           4'571'603
----------------------------------------------------------------------------------------------------

LIABILITIES
Current Liabilities
Trade and other payables                                                307'293             338'862
Short-term financial debts                                               47'296              51'224
Income taxes                                                            143'313             146'086
Deferred income - current                                                46'894              47'200
Other current liabilities                                               161'282             170'019
----------------------------------------------------------------------------------------------------
Total Current Liabilities                                               706'078             753'391
----------------------------------------------------------------------------------------------------

Non-Current Liabilities
Long-term financial debts                                               545'052             532'022
Deferred tax liabilities                                                 13'846              15'919
Deferred income - non current                                           158'765             174'911
Provisions and other long-term liabilities                              215'548             213'556
----------------------------------------------------------------------------------------------------
Total Non-Current Liabilities                                           933'211             936'408
----------------------------------------------------------------------------------------------------
Total Liabilities                                                     1'639'289           1'689'799
----------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------
Minority Interests                                                          (26)              1'614
----------------------------------------------------------------------------------------------------

SHAREHOLDERS' EQUITY
Share capital                                                           254'359             253'895
Share premium                                                         1'021'095           1'002'991
Treasury shares                                                        (413'427)           (157'642)
Retained earnings                                                     1'812'264           1'669'700
Fair value and other reserves                                            12'428              22'711
Cumulative foreign currency translation adjustments                      58'990              88'535
----------------------------------------------------------------------------------------------------
Total Shareholders' Equity                                            2'745'709           2'880'190
----------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------
Total Liabilities, Minority Interests and Shareholders' Equity        4'384'972           4'571'603
----------------------------------------------------------------------------------------------------


* Unaudited


                                     -more-



CONSOLIDATED STATEMENTS OF EQUITY


                                                                                                CUMULATIVE
                                                                                                   FOREIGN
                                                                                   FAIR VALUE     CURRENCY
                                            SHARE      SHARE  TREASURY   RETAINED   AND OTHER  TRANSLATION
                                          CAPITAL    PREMIUM    SHARES   EARNINGS    RESERVES  ADJUSTMENTS      TOTAL
                                          US$'000    US$'000   US$'000    US$'000     US$'000      US$'000    US$'000
                                                                                       

Balance as of January 1, 2003             253'416    989'141  -126'460  1'364'626     -44'807       25'282  2'461'198
Issue of share capital to employees           450     13'259     3'571                                         17'280
Net income for 2003                                                       167'896                             167'896
Purchase of treasury shares                                    -24'637                                        -24'637
Dividend for 2002 - bearer shares                                         -61'849                             -61'849
Dividend for 2002 - registered shares                                     -23'860                             -23'860
Revaluation adjustments                                                                 8'380                   8'380
Foreign currency translation adjustments                                                            29'452     29'452
---------------------------------------------------------------------------------------------------------------------
Balance as of June 30, 2003 *             253'866  1'002'400  -147'526  1'446'813     -36'427       54'734  2'573'860
=====================================================================================================================

Balance as of January 1, 2004             253'895  1'002'991  -157'642  1'669'700      22'711       88'535  2'880'190
Issue of share capital to employees           464     18'104     3'189                                         21'757
Net income for 2004                                                       241'918                             241'918
Purchase of treasury shares                                   -258'974                                       -258'974
Dividend for 2003 - bearer shares                                         -71'096                             -71'096
Dividend for 2003 - registered shares                                     -28'258                             -28'258
Revaluation adjustments                                                               -10'283                 -10'283
Foreign currency translation adjustments                                                           -29'545    -29'545
---------------------------------------------------------------------------------------------------------------------
Balance as of June 30, 2004 *             254'359  1'021'095  -413'427  1'812'264      12'428       58'990  2'745'709
=====================================================================================================================


*Unaudited


                                     -more-



CONSOLIDATED STATEMENTS OF CASH FLOWS


SIX MONTHS ENDED JUNE 30                                                  2004 *     2003 *
                                                                         US$'000    US$'000
                                                                             

Cash Flows From Operating Activities
Income before taxes and minority interests                               286'079    200'948
Depreciation and amortization                                             65'905     67'514
Financial income                                                         (32'029)   (24'964)
Financial expense                                                         12'361     11'325
Other non-cash items                                                       6'607     37'641
--------------------------------------------------------------------------------------------
Cash Flows From Operating Activities Before Working Capital Changes      338'923    292'464
--------------------------------------------------------------------------------------------

Working Capital Changes
Trade accounts payable, other current liabilities and deferred income     (2'802)    33'728
Trade accounts receivable                                                (26'532)   (50'599)
Inventories                                                                5'942    (31'605)
Prepaid expenses and other current assets                                (13'858)    (5'115)
Taxes paid                                                               (49'532)   (53'651)
--------------------------------------------------------------------------------------------
NET CASH FLOWS FROM OPERATING ACTIVITIES                                 252'141    185'222
--------------------------------------------------------------------------------------------

Cash Flows From Investing Activities
Purchase of property, plant and equipment                                (85'810)   (90'301)
Proceeds from sale of property, plant and equipment                        3'159      2'689
Purchase of intangible and other long-term assets                         (9'936)    (7'145)
Purchase of financial assets                                            (837'588)  (299'384)
Proceeds from sale of financial assets                                   302'126    185'637
Interest received                                                         53'363     44'424
--------------------------------------------------------------------------------------------
Net Cash Flows From Investing Activities                                (574'686)  (164'080)
--------------------------------------------------------------------------------------------

Cash Flows From Financing Activities
Proceeds from issuance of share capital                                   10'333     13'105
Proceeds from exercises of stock options                                     677        470
Premiums received on written calls                                            --        508
Issuance of long-term financial debt                                      17'339      7'016
Purchase of treasury shares                                             (258'974)   (24'637)
Net change in bank advances                                                2'301    (30'983)
Repayment of long-term debt                                               (5'436)        --
Other non-current liabilities                                             (5'319)    (9'444)
Interest paid                                                             (2'593)    (2'599)
Dividends paid                                                           (99'352)   (85'709)
--------------------------------------------------------------------------------------------
Net Cash Flows From Financing Activities                                (341'024)  (132'273)
--------------------------------------------------------------------------------------------
Effect of Exchange Rate Changes on Cash and Cash Equivalents              (1'444)     3'229
--------------------------------------------------------------------------------------------
Net Decrease in Cash and Cash Equivalents                               (665'013)  (107'902)
--------------------------------------------------------------------------------------------

Cash and Cash Equivalents
- Beginning of period                                                  1'003'972    686'033
--------------------------------------------------------------------------------------------
- End of period                                                          338'959    578'131
--------------------------------------------------------------------------------------------


* Unaudited


                                     -more-

SELECTED EXPLANATORY NOTES TO THE INTERIM CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)

1. ACCOUNTING PRINCIPLES
The accompanying condensed unaudited interim consolidated financial statements
have been prepared in accordance with IAS 34 (Interim Financial Reporting). The
accounting policies used in the preparation of the interim consolidated
financial statements are consistent with those used by Serono in its annual
consolidated financial statements for the year ended December 31, 2003. These
interim consolidated financial statements should be read in conjunction with the
2003 annual consolidated financial statements. These consolidated financial
statements were approved for issuance on July 16, 2004 by Serono S.A.'s board of
directors.

2. ADOPTION OF INTERNATIONAL ACCOUNTING STANDARDS
There were no new standards adopted in the first 6 months of the year.

3. SEGMENT INFORMATION - GEOGRAPHIC SEGMENT



                                           NORTH   LATIN
                                 EUROPE  AMERICA  AMERICA    OTHER      GROUP
SIX MONTHS ENDED JUNE 30, 2004   US$000   US$000   US$000   US$000     US$000
------------------------------------------------------------------------------
                                                     
Product sales                   445,970  389,260   55,051  165,054  1,055,335
Royalty and license income       39,701      606        -   49,053     89,360
------------------------------------------------------------------------------
Total revenues                  485,671  389,866   55,051  214,107  1,144,695
Allocable operating income      217,490  190,110   27,404   67,965    502,969
Corporate R&D expenses                                               (194,067)
Unallocated expenses                                                  (47,267)
------------------------------------------------------------------------------
Operating income                                                      261,635
------------------------------------------------------------------------------

                                           North   Latin
                                 Europe  America  America    Other      Group
Six months ended June 30, 2003   US$000   US$000   US$000   US$000     US$000
------------------------------------------------------------------------------
Product sales                   389,035  321,719   40,951  123,495    875,200
Royalty and license income       41,353      270        -   34,010     75,633
------------------------------------------------------------------------------
Total revenues                  430,388  321,989   40,951  157,505    950,833
Allocable operating income      196,825  191,623   12,790   39,479    440,717
Corporate R&D expenses                                               (196,087)
Unallocated expenses                                                  (59,453)
------------------------------------------------------------------------------
Operating income                                                      185,177
------------------------------------------------------------------------------


Unallocated expenses represent corporate expenses. Product sales are based on
the country in which the customer is located, while royalty and license income
is based on the country that receives the royalty. There are no sales or other
transactions between the business segments.

4. TAXES
The effective tax rate for the six months ended June 30, 2004 amounts to 16.0%
(2003: 16.0%).


                                     -more-

5. EARNINGS PER SHARE
Basic earnings per share is calculated in accordance with IAS 33 (Earnings per
Share) by dividing the net income of the company by the weighted average number
of shares outstanding during the period presented.



                                                              2004        2003
Six months ended June 30 (unaudited)                        US$000      US$000
------------------------------------------------------------------------------
                                                              
Net income attributable to bearer shareholders             173,803     121,194
Net income attributable to registered shareholders          68,115      46,702
------------------------------------------------------------------------------
Total net income                                           241,918     167,896

Weighted average number of bearer shares in issue       11,240,537  11,431,665
Weighted average number of registered shares in issue   11,013,040  11,013,040

                                                               US$         US$
------------------------------------------------------------------------------
Basic earnings per bearer share                              15.46       10.60
Basic earnings per registered share                           6.18        4.24
Basic earnings per American depositary share                  0.39        0.27
------------------------------------------------------------------------------


For diluted earnings per share, the weighted average number of bearer shares is
adjusted to assume conversion of all potential dilutive shares arising from
outstanding stock options and the convertible bond. For stock options a
calculation is done to determine the number of shares that could have been
acquired at fair value with proceeds from the exercise of stock options and
compared with the number of shares that would have been issued assuming the
exercise of the stock options. The difference is added to the denominator as
additional shares issued for no consideration. There is no adjustment made to
the numerator. During the first six months ended June 30, 2004, share
equivalents of 30,103 bearer shares arising from stock options granted to
employees and directors were included in calculating diluted earnings per share
(2003: 14,046). For the convertible bond, a calculation is done that assumes the
bond is fully converted into bearer shares while the net income is increased by
eliminating the interest expense, net of tax, that would not be incurred if the
bond was converted. In the first half 2004 as well as in 2003, the effect of the
convertible bond was excluded from the calculation of diluted earnings per share
as it was anti-dilutive. Diluted earnings per bearer, registered and American
depositary shares were:



                                                              2004        2003
Six month ended June 30 (unaudited)                         US$000      US$000
------------------------------------------------------------------------------
                                                              
Net income attributable to bearer shareholders             173,934     121,235
Net income attributable to registered shareholders          67,984      46,661
------------------------------------------------------------------------------
Total net income                                           241,918     167,896

Weighted average number of bearer shares in issue       11,270,640  11,445,711
Weighted average number of registered shares in issue   11,013,040  11,013,040

                                                               US$         US$
------------------------------------------------------------------------------
Diluted earnings per bearer share                            15.43       10.59
Diluted earnings per registered share                         6.17        4.24
Diluted earnings per American depositary share                0.39        0.26
------------------------------------------------------------------------------



                                     -more-



6. SHARE CAPITAL

                                                                           NUMBER  NOMINAL
CLASS OF SHARES                                                         OF SHARES    VALUE   CHF000   US$000
------------------------------------------------------------------------------------------------------------
                                                                                         
As of June 30, 2004
Issued and fully paid share capital
Registered                                                             11,013,040  CHF10    110,130   68,785
Bearer                                                                 11,735,125  CHF25    293,379  185,574
------------------------------------------------------------------------------------------------------------
Total                                                                                       403,509  254,359
------------------------------------------------------------------------------------------------------------
Authorized share capital - bearer                                       1,400,000  CHF25     35,000   27'917
Conditional share capital - bearer for option and/or convertible        1,452,000  CHF25     36,300   28,954
Debt
Conditional share capital - bearer for stock options                      729,701  CHF25     18,243   14,551
------------------------------------------------------------------------------------------------------------

As of June 30, 2003
Issued and fully paid share capital
Registered                                                             11,013,040  CHF10    110,130   68,785
Bearer                                                                 11,710,250  CHF25    292,757  185,081
------------------------------------------------------------------------------------------------------------
Total                                                                                       402,887  253,866
------------------------------------------------------------------------------------------------------------
Authorized share capital - bearer                                       1,400,000  CHF25     35,000   25,766
Conditional share capital - bearer for option and/or convertible debt     152,000  CHF25      3,800    2,797
Conditional share capital - bearer for stock options                      354,572  CHF25      8,864    6,526
------------------------------------------------------------------------------------------------------------


During the Annual General Meeting held on May 25th, 2004, shareholders approved
increasing the conditional capital to CHF 36,300,000 (1,452,000 bearer shares of
a par value of CHF 25) for option and/or convertible loans and to CHF 18,825,000
(753,000 bearer shares of a par value of CHF 25) for stock options. In addition,
shareholders have approved the authorization to increase capital by CHF
35,000,000 (1,400,000 bearer shares of a par value of CHF 25) for a period of
two years.

7. TREASURY SHARES
There were 304,939 treasury shares held by a group company as of January 1,
2004. During the first five months ended May 31, 2004, 351,209 bearer shares
were purchased for a total consideration of CHF280.9 million or $221.8 million,
which resulted in the complete utilization of the CHF500 million share buy back
plan that was initiated in July 2002. During the same period, 6,927 treasury
shares were distributed to employees mostly as part of an Employee Share
Purchase Plan whereby shares purchased under the plan that are held for one year
after the purchase date entitle each participant to receive, on a one-time
basis, one matching share for every three shares purchased and held.

In June 2004, a second share buy back plan was initiated that is authorized to
acquire CHF750 million in bearer shares; however, the shares acquired under this
second plan will be cancelled and thus will not be available for re-issue. The
total cost of the shares acquired under the second share buy back plan is
CHF46.6 million or $37.2 million. The total number of treasury shares held as of
June 30, 2004 is 708,271 of which 59,050 will eventually be cancelled.

8. DISTRIBUTION OF EARNINGS
At the Annual Shareholders' Meeting on May 25, 2004, a proposed gross dividend
in respect of 2003 of CHF3.20 (2002: CHF2.80) per registered share and CHF8.00
(2002: CHF7.00) per bearer share, amounting to a total of CHF123.9 million
(2002: CHF110.8 million), was ratified. This dividend, equivalent to $99.4
million, was subsequently paid on May 28, 2004 and has been accounted for in
shareholders' equity as an appropriation of retained earnings in the six months
ended June 30, 2004.


                                     -more-

9. STOCK OPTION PLAN
Movements in the number of employee stock options outstanding are as follows:



                                                      Weighted
                                                       average
                                                      exercise
                                            Options      price
                                        outstanding        CHF
--------------------------------------------------------------
                                                
As of January 1, 2003                       209,455      1,272
Cancelled                                   (22,062)     1,301
Granted                                      93,130        655
Exercised                                    (2,741)       546
--------------------------------------------------------------
As of December 31, 2003                     277,782      1,070
Cancelled                                   (13,124)     1,103
Granted                                     120,780        721
Exercised                                    (1,480)       578
--------------------------------------------------------------
As of June 30, 2004                         383,958        961
--------------------------------------------------------------


During the first six months ended June 30, 2004, 120,780 options (2003: 91,950
options) were granted to a total of 598 employees (2003: 567 employees), at a
predetermined weighted average exercise price of CHF721 (2003: CHF 655). The
total number of options available for grant as of June 30, 2004 is 327,291

There is also a stock option plan reserved for the Board of Directors that is
similar to the Employee Stock Option plan. In June 2004, 5,200 options (2003:
4,600) were granted to directors, at a predetermined exercise price of CHF772
(2003: CHF 692). There are 20,720 director options outstanding as of June 30,
2004 with a weighted average exercise price of CHF 755.

10. SHARE PURCHASE PLANS

EMPLOYEE SHARE PURCHASE PLAN
The group has an Employee Share Purchase Plan ("the ESPP") covering
substantially all of its employees. The plan is designed to allow employees to
purchase bearer shares or American depositary shares at 85% of the lower of the
fair market value at either the date of the beginning of the plan period or the
purchase date. Purchases under the plan are subject to certain restrictions and
may not exceed 15% of the employee's annual salary. In January 2004, 20,301
bearer shares (2003: 23,229 bearer shares) were issued to employees at a price
of CHF654 per share (2003: CHF654 per share). As of June 30, 2004, a total of
$5.3 million (2003: $4.8 million) in contributions held by the company to be
used to purchase bearer and American depositary shares on behalf of employees in
January 2005. The accrued compensation cost from the discount to be offered to
employees based on the contributions held as at June 30, 2004 is $0.5 million
(2003: $1.5 million).

Shares purchased under the plan that are held for one year after the purchase
date entitle each participant to receive, on a one-time basis, one matching
share for every three shares purchased and held. In January 2004, 6,648 bearer
shares (2003: 4,208) were distributed to employees. The accrued compensation
cost for the six months ended June 30, 2004, related to the matching shares that
will be distributed in January 2005, is $2.1 million (2003: $1.9 million) and is
calculated based on the estimated number of matching shares multiplied by the
current month-end share price.

DIRECTOR SHARE PURCHASE PLAN
During 2003, the group initiated a Share Purchase Plan reserved for its Board of
Directors (the "DSPP"). The DSPP allows board members to purchase Serono S.A.
bearer shares through allocation of 50% or 100% of their gross yearly fees. Each
cycle commences on the first business day following the company's Annual General
Meeting (the "AGM") and concludes on the day of the next AGM. The purchase price
per share is eighty-five percent of the fair market value of the share on the
fifth business day following the AGM. In June, 1,518 bearer shares were issued
to Directors that participated in the plan.


                                     -more-

11. PRINCIPAL SHAREHOLDER
At June 30, 2004, Bertarelli & Cie, a partnership limited by shares with its
principal offices at Cheserex (Vaud), Switzerland, held 53.8% of the capital and
62.7% of the voting rights in Serono S.A. Ernesto Bertarelli controls Bertarelli
& Cie. On the same date, Maria-Iris Bertarelli, Ernesto Bertarelli and Donata
Bertarelli Spath owned in the aggregate 7.3% of the capital and 10.1% of the
voting rights of Serono S.A.


                                      -end-

                                   SIGNATURES

     Pursuant  to  the  requirements of the Securities Exchange Act of 1934, the
registrant  has  duly  caused  this  report  to  be  signed on its behalf by the
undersigned,  thereunto  duly  authorized.



                                                  SERONO  S.A.
                                                  a  Swiss  corporation
                                                  (Registrant)



July 22, 2004                           By:       /s/  Francois Naef
                                                  ----------------------
                                                  Name:  Francois Naef
                                                  Title: Secretary