SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                   -----------

                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
             TO RULE 13d-l(a) AND AMENDMENTS THERETO FILED PURSUANT
                                TO RULE 13d-2(a)

                                (Amendment No. 1)

                            IRIS International, Inc.
                                                            
                                (Name of Issuer)

                     Common Stock, $0.01 par value per share
                                                                         
                         (Title of Class of Securities)

                                    460259500
                                                                
                                 (CUSIP Number)

                             Seth H. Hoogasian, Esq.
                                 General Counsel
                           Thermo Electron Corporation
                                 81 Wyman Street
                        Waltham, Massachusetts 02454-9046
                                 (781) 622-1000
                                                                           
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                December 31, 2004
                                                                              
             (Date of Event Which Requires Filing of This Statement)

     If the filing  person has  previously  filed a statement on Schedule 13G to
report the  acquisition  that is the subject of this Schedule 13D, and is filing
this  schedule  because  of Rule  13d-1(e),  13d-1(f)  or  13d-1(g),  check  the
following box ?.

                    Note. Schedules filed in paper format shall include a signed
           original and five copies of the schedule, including all exhibits. See
                  Rule 13d-7(b) for other parties to whom copies are to be sent.


                         (Continued on following pages)






                                                                                          


----------------------------------------                                       -------------------------------------
          CUSIP NO. 460259500                            13D                            Page 2 of 9 Pages
----------------------------------------                                       -------------------------------------


-------- -----------------------------------------------------------------------------------------------------------
1. NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

         Thermo Electron Corporation
         04-2209186
-------- -----------------------------------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) []
                                                                                                        (b) []
-------- -----------------------------------------------------------------------------------------------------------
3. SEC USE ONLY
-------- -----------------------------------------------------------------------------------------------------------
4. SOURCE OF FUNDS*

         WC
-------- -----------------------------------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e)             []
-------- -----------------------------------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
         State of Delaware
---------------------------- -------- ------------------------------------------------------------------------------
     NUMBER OF SHARES        7.       SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH                   -0-
   REPORTING PERSON WITH
                             -------- ------------------------------------------------------------------------------
                             8.              SHARED VOTING POWER 454,700
                             -------- ------------------------------------------------------------------------------
                             9. SOLE DISPOSITIVE POWER
                                             -0-
                              -------- ------------------------------------------------------------------------------
                             10. SHARED DISPOSITIVE POWER
                                             454,700
---------------------------- -------- ------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           454,700
---------- ---------------------------------------------------------------------------------------------------------
12.        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                           []     


---------- ---------------------------------------------------------------------------------------------------------
13.                 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.8%
---------- ---------------------------------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON*

           CO
---------- ---------------------------------------------------------------------------------------------------------
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!






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

          CUSIP NO. 460259500                            13D                            Page 3 of 9 Pages
----------------------------------------                                       -------------------------------------
-------- -----------------------------------------------------------------------------------------------------------
1. NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

         Thermo Securities Corporation
         04- 2746030
-------- -----------------------------------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) []
                                                                                                        (b) []
-------- -----------------------------------------------------------------------------------------------------------
3. SEC USE ONLY

-------- -----------------------------------------------------------------------------------------------------------
4. SOURCE OF FUNDS*

         WC
-------- -----------------------------------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e)             []

-------- -----------------------------------------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION
         State of Delaware
---------------------------- -------- ------------------------------------------------------------------------------

     NUMBER OF SHARES        7.       SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH                   -0-
   REPORTING PERSON WITH     -------- ------------------------------------------------------------------------------
                             8.              SHARED VOTING POWER 454,700
                             
                             -------- ------------------------------------------------------------------------------
                             9. SOLE DISPOSITIVE POWER
                                             -0-
                             -------- ------------------------------------------------------------------------------
                             10. SHARED DISPOSITIVE POWER
                                             454,700
---------------------------- -------- ------------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                           454,700
---------- ---------------------------------------------------------------------------------------------------------
12.        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                           []

---------- ---------------------------------------------------------------------------------------------------------
13.                 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.8%

---------- ---------------------------------------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON*

           CO
---------- ---------------------------------------------------------------------------------------------------------
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!






     Thermo Electron Corporation, a Delaware corporation,  and Thermo Securities
Corporation, a Delaware Corporation (the "Reporting Persons"),  hereby amend its
statement  on Schedule  13D  relating to the common  stock,  $0.01 par value per
share (the "Common  Stock"),  of IRIS  International,  Inc.  (formerly  known as
International  Remote  Imaging  Systems,  Inc.),  a  Delaware  corporation  (the
"Company").

ITEM 2. Identity and Background.

     Item 2 is hereby amended and restated as follows:

     This  Amendment is being filed by the  Reporting  Persons  pursuant to Rule
13d-2 to reflect the change of  information  previously  reported  under Item 2,
Item 3 and Item 5 of the  Schedule  13D  filed by  Thermo  Electron  Corporation
("Thermo"),  Thermo Amex  Convertible  Growth Fund I, L.P. (the "Fund"),  Thermo
Amex Finance, L.P. ("TAF"), and Thermo Amex Management Company, Inc. ("TAMC").

     The shares of Common Stock of the Company were originally owned directly by
the  Fund  and  indirectly  by TAF as the  sole  general  partner  of the  Fund,
indirectly by TAMC as the sole general  partner of TAF and indirectly by Thermo,
which owned 100% of the outstanding  capital stock of TAMC. TAMC was merged into
Thermo Securities  Corporation,  a wholly-owned subsidiary of Thermo, in October
2001, and the Fund and TAF were dissolved in August 2002.

     The  principal  business  address  and  principal  office  address  of  the
Reporting Persons is 81 Wyman Street, Waltham, Massachusetts 02454-9046.

     Thermo is a leading provider of analytical and monitoring  instruments used
in a broad range of applications, from life sciences research to food, drug, and
beverage production.

     Appendix A attached  to hereto  sets forth with  respect to each  executive
officer and director of the  Reporting  Persons the following  information:  (a)
name; (b) business address;  (c) present principal  occupation or employment and
the  name,   principal   business  and  address  of  any  corporation  or  other
organization in which such employment is conducted; and (d) citizenship.  To the
knowledge of the Reporting Persons, there is no person who may be deemed to be a
controlling person of the Reporting Persons.

     During the last five  years,  neither  the  Reporting  Persons  nor, to the
knowledge of the Reporting  Persons,  any  executive  officer or director of the
Reporting Persons has been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors).

     During the last five  years,  neither  the  Reporting  Persons  nor, to the
knowledge of the Reporting  Persons,  any  executive  officer or director of the
Reporting  Persons  has  been a party to a civil  proceeding  of a  judicial  or
administrative  body of  competent  jurisdiction  which  resulted in a judgment,
decree  or final  order  enjoining  future  violations  of,  or  prohibiting  or
mandating activities subject to, Federal or State securities laws or finding any
violation with respect to such laws.

                                 (Page 4 of 9)


ITEM 3. Source and Amount of Funds or Other Consideration:

     Item 3 is hereby amended and restated in its entirety as follows:

     On  December  31,  1996,  the  Fund  acquired  3,000  shares  of  Series  A
Convertible  Preferred  Stock,  $.01 par value (the "Fund  Shares")  for a total
purchase price of $3,000,000 and five-year Warrants to purchase 84,270 shares of
Common Stock for a total price of $842.70 (the "Fund Warrants"). The Fund Shares
and the Fund Warrants were  convertible  into, or exercisable  for,  842,696 and
84,270 shares, respectively,  of the Company's Common Stock. The working capital
of the Fund was the source of funds for this  purchase.  No part of the purchase
price was  represented  by funds or other  consideration  borrowed or  otherwise
obtained  for  the  purpose  of  acquiring,   holding,  trading  or  voting  the
securities.

     Pursuant to the Securities  Purchase  Agreement between the Company and the
Fund,  if the Fund Shares were  converted  after April 1, 1997,  the  conversion
price  was  determined  by a  formula  based on the  closing  bid  prices of the
Company's Common Stock as listed on the American Stock Exchange, provided that a
maximum of two million  shares of Common  Stock would be issued.  On October 21,
1999, the Fund was issued 2,000,000 shares of Common Stock pursuant to the Stock
Purchase Agreement.

ITEM 5. Interest in Securities of the Issuer.

     Item 5 is hereby amended and restated in its entirety as follows:

     (a) As of the date of this Amendment,  Thermo Securities Corporation is the
record  owner of 454,700  shares of Common  Stock which  represents  2.8% of the
outstanding  Common  Stock of the  Company,  based upon the total  Common  Stock
outstanding as reported on the Company's  Quarterly  Report on Form 10-Q for the
period ended  September 30, 2004.  Because of its  relationship as the parent of
Thermo Securities Corporation, Thermo Electron Corporation may be also deemed to
own the 454,700 shares of Common Stock of the Company.  Information with respect
to the  beneficial  ownership of the shares of Common Stock of the other persons
named in Item 2 is set forth in  Appendix A. Except as set forth in this Item 5,
to the best  knowledge of the  Reporting  Persons,  none of the parties named in
Item 2 owns any of the Company's Common Stock.

     (b) Each  Reporting  Person has the shared power to vote all 454,700 shares
of Common Stock of the Company beneficially owned by the Reporting Persons.

     Item 1 sets forth the Company's name and state of incorporation  along with
the address of its principal business and principal office. The Company designs,
develops,  manufactures  and  markets  in vitro  diagnostic  ("IVD")  equipment,
including  IVD imaging  systems  based on  patented  and  proprietary  automated
intelligent  microscopy  technology,  as well as special purpose centrifuges and
other small  instruments  for  automating  microscopic  procedures  performed in
clinical  laboratories.  To the best knowledge of the Reporting Persons,  during
the last five  years,  the Company (i) has not been  convicted  in any  criminal
proceeding (excluding traffic violations

                                 (Page 5 of 9)

                                                            
or similar  misdemeanors)  and (ii) was not a party to a civil  proceeding  of a
judicial or administrative body of competent  jurisdiction as result of which it
was or is  subject  to a  judgment,  decree  or  final  order  enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, Federal or
State securities laws or finding any violation with respect to such laws.

     (c) Except as  described  below in this Item 5, which item is  incorporated
herein by reference,  neither the Reporting Persons nor, to the knowledge of the
Reporting Persons,  any person named in Appendix A beneficially has effected any
transactions in Common Stock during the past 60 days.

     The Reporting  Persons have  affected the following  open market sales with
respect to the Common Stock since the filing of its initial Schedule 13D:

--------------------- ----------------------------- ----------------------------
Date                           Amount                        Price Per Share
--------------------- ----------------------------- ----------------------------
7-Jan-04                       150,000                           $ 6.15
--------------------- ----------------------------- ----------------------------
20-Apr-04                      400,000                           $ 6.55
--------------------- ----------------------------- ----------------------------
 22-Apr-04                      15,000                           $ 7.25
--------------------- ----------------------------- ----------------------------
8-Sep-04                       300,000                           $ 7.00
--------------------- ----------------------------- ----------------------------
5-Oct-04                        75,000                         $ 7.8383
--------------------- ----------------------------- ----------------------------
6-Oct-04                        20,000                         $ 7.8875
--------------------- ----------------------------- ----------------------------
7-Oct-04                        35,000                         $ 7.8214
--------------------- ----------------------------- ----------------------------
8-Oct-04                         5,000                           $ 7.80
--------------------- ----------------------------- ----------------------------
13-Oct-04                      175,000                           $ 7.32
--------------------- ----------------------------- ----------------------------
10-Dec-04                       16,600                         $ 8.6515
--------------------- ----------------------------- ----------------------------
13-Dec-04                       70,000                         $ 8.8232
--------------------- ----------------------------- ----------------------------
14-Dec-04                       50,000                          $ 8.849
--------------------- ----------------------------- ----------------------------
15-Dec-04                       53,400                         $ 8.8536
--------------------- ----------------------------- ----------------------------
16-Dec-04                       50,000                           $ 8.77
--------------------- ----------------------------- ----------------------------
17-Dec-04                       60,000                         $ 8.6363
--------------------- ----------------------------- ----------------------------
23-Dec-04                       15,800                          $ 8.947
--------------------- ----------------------------- ----------------------------
27-Dec-04                       23,200                         $ 8.9603
--------------------- ----------------------------- ----------------------------
28-Dec-04                       31,300                         $ 9.0005
--------------------- ----------------------------- ----------------------------


(d) None.

(e) Not applicable.





                                   SIGNATURES

     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.


                                      Dated:  March 2, 2005

                                      THERMO ELECTRON CORPORATION


                                      By:       /s/ Kenneth J. Apicerno        
                                                --------------------------------
                                      Name:     Kenneth J. Apicerno
                                      Title:    Treasurer




                                      THERMO SECURITIES CORPORATION


                                                                          
                                      By:       /s/ Kenneth J. Apicerno      
                                                --------------------------------
                                      Name:     Kenneth J. Apicerno
                                      Title:    Treasurer





                                   APPENDIX A

Thermo Electron Corporation

     The  name,  present  principal  occupation  or  employment  and  beneficial
ownership of shares of common stock of IRIS International,  Inc. (the "Company")
of each director and executive officer of Thermo Electron  Corporation  ("Thermo
Electron") is set forth below.  Unless otherwise noted, all such individuals are
citizens of the United States.  Unless  otherwise noted, the business address of
each  executive  officer  and  director of Thermo  Electron is 81 Wyman  Street,
Waltham, Massachusetts 02454-9046.

Directors


                                                                                                        

-------------------------------------- ---------------------------------------- ---------------------------------------------
                                                                                   Beneficial Ownership of Shares of the
                                                                                            Company Common Stock
                                                                                ------------- ----------------- -------------
                                                                                                   Shares
                                                                                                 Underlying
                                                                                                  Options
                                                                                                Exercisable
                                                                                                  Prior to         Total
       Name/Present Principal                                                   Shares Held     December 31,     Beneficial
      Occupation or Employment                    Business Address                Outright          2004         Ownership
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
John L. LaMattina                      Pfizer Inc.                                       0                 0             0
Senior Vice President of Pfizer Inc.   50 Pequot Avenue
and the President of Pfizer Global     New London, Connecticut 06230
Research and Development
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Peter J. Manning
Director of Safety Insurance Group                                                       0                 0             0
Inc.
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Jim P. Manzi
Chairman of the Board of Thermo
Electron and Chairman of Stonegate                                                       0                 0             0
Capital
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Robert A. McCabe                                                                         0                 0             0
Chairman of Pilot Capital Corporation
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Robert W. O'Leary                      Valeant Pharmaceuticals International             0                 0             0
Chairman and Chief Executive Officer   3300 Hyland Avenue
of Valeant Pharmaceuticals             Costa Mesa, California 92626
International                                                                             
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Michael E. Porter                      Harvard Business School                           0                 0             0
Bishop William Lawrence                Soldiers Field Road
University Professor at                Boston, Massachusetts 02163
Harvard Business School
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Elaine S. Ullian                       Boston Medical Center                             0                 0             0
President and Chief Executive          Talbot 1
Officer of Boston Medical Center       One Boston Medical Center Place
                                       Boston, Massachusetts 02118
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Marijn E. Dekkers(1)                                                                     0                 0             0
President, Chief Executive Officer
and Director of Thermo Electron
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------


(1) Mr. Dekkers is a citizen of The Netherlands.




Executive Officers Who are Not Directors

         No person is a controlling stockholder of Thermo Electron.


                                                                                                       

-------------------------------------- ---------------------------------------- ---------------------------------------------
                                                                                   Beneficial Ownership of Shares of the
                                                                                            Company Common Stock
                                                                                ------------- ----------------- -------------
       Name/Present Principal                     Business Address              Shares Held        Shares          Total
                                                                                                 Underlying
                                                                                                  Options
                                                                                                Exercisable
                                                                                                  Prior to
                                                                                                December 31,     Beneficial
      Occupation or Employment                                                    Outright          2004         Ownership
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Guy Broadbent(2)                                                                         0                 0             0
Vice President of Thermo Electron
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Marc N. Casper                                                                           0                 0             0
Senior Vice President of
Thermo Electron
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Seth H. Hoogasian                                                                        0                 0             0
Vice President, General Counsel and
Secretary of Thermo Electron
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Peter E. Hornstra                                                                        0                 0             0
Corporate Controller and Chief
Accounting Officer of Thermo Electron
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Peter M. Wilver                                                                          0                 0             0
Vice President and Chief Financial
Officer of Thermo Electron
-------------------------------------- ---------------------------------------- ------------- ----------------- -------------
Stephen G. Sheehan                                                                       0                 0             0
Vice President, Human Resources of
Thermo Electron
------------------------------------------------------------------------------- ------------- ----------------- -------------
All directors and current executive officers as a group                                  0                 0             0
------------------------------------------------------------------------------- ------------- ----------------- -------------


(2) Mr. Broadbent is a citizen of the United Kingdom.

.