SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                  SCHEDULE 13G
                                 (Rule 13d-102)


             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
           TO RULES 13d-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED
                            PURSUANT TO RULE 13d-2(b)

                                (Amendment No. ()


                                    Merrimac
--------------------------------------------------------------------------------
                                (Name of Issuer)


                          Common Stock, $.01 Par Value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   0000706864
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                                December 31, 2007
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


     Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

          [X] Rule 13d-1(b)

          [_] Rule 13d-1(c)

          [_] Rule 13d-1(d)


----------
(1)  The  remainder  of this  cover  page  shall be filled  out for a  reporting
     person's  initial  filing on this form with respect to the subject class of
     securities,  and for any subsequent amendment containing  information which
     would alter the disclosures provided in a prior cover page.

     The  information  required in the remainder of this cover page shall not be
deemed to be "filed"  for the purpose of Section 18 of the  Securities  Exchange
Act of 1934 or otherwise  subject to the  liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).





CUSIP No. 0000706864                  13G                      Page 2 of 5 Pages


--------------------------------------------------------------------------------
1. NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)


                        David J. Greene and Company, LLC
--------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [_]
                                                                      (b) [X]

--------------------------------------------------------------------------------
3. SEC USE ONLY



--------------------------------------------------------------------------------
4. CITIZENSHIP OR PLACE OF ORGANIZATION


                                    New York
--------------------------------------------------------------------------------
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               -----------------------------------------------------------------
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          216,060
               -----------------------------------------------------------------
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               -----------------------------------------------------------------
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            300,660
--------------------------------------------------------------------------------
9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    300,660

--------------------------------------------------------------------------------
10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

--------------------------------------------------------------------------------
11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                    10.28


--------------------------------------------------------------------------------
12. TYPE OF REPORTING PERSON* Broker-dealer/Investment Adviser/Other (BD/IA/OO)


The filing of this  statement  shall not be construed as an admission that David
J. Greene and Company,  LLC is the beneficial owner of the securities covered by
such statement
--------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!




CUSIP No. 0000706864                  13G                      Page 3 of 5 Pages


Item 1(a).  Name of Issuer:


                  Merrimac Corp.
            --------------------------------------------------------------------

Item 1(b).  Address of Issuer's Principal Executive Offices:

                  41 Fairfield Place, W Caldwell, NJ  07006
            --------------------------------------------------------------------

Item 2(a).  Name of Person Filing:

                  David J. Greene and Company, LLC

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

Item 2(b).  Address of Principal Business Office, or if None, Residence:


                  599 Lexington Avenue, New York, NY  10022
            --------------------------------------------------------------------

Item 2(c).  Citizenship:


                  New York
            --------------------------------------------------------------------

Item 2(d).  Title of Class of Securities:


                  Common Stock
            --------------------------------------------------------------------

Item 2(e).  CUSIP Number:  0000706864
            --------------------------------------------------------------------

Item 3.     If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or
            (c), Check Whether the Person Filing is a:

     (a)    [X] Broker or dealer  registered  under  Section 15 of the  Exchange
                Act.

     (b)    [_] Bank as defined in Section 3(a)(6) of the Exchange Act.

     (c)    [_] Insurance company as defined in Section 3(a)(19) of the Exchange
                Act.

     (d)    [_] Investment  company registered under Section 8 of the Investment
                Company Act.

     (e)    [X] An    investment    adviser    in    accordance    with     Rule
                13d-1(b)(1)(ii)(E);

     (f)    [_] An employee  benefit plan or endowment  fund in accordance  with
                Rule 13d-1(b)(1)(ii)(F);

     (g)    [_] A parent holding  company or control  person in accordance  with
                Rule 13d-1(b)(1)(ii)(G);

     (h)    [_] A savings  association as defined in Section 3(b) of the Federal
                Deposit Insurance Act;

     (i)    [_] A  church plan that is  excluded  from  the   definition  of  an
                investment  company  under  Section  3(c)(14) of the  Investment
                Company Act;

     (j)    [_] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).





CUSIP No. 0000706864                  13G                          Page of Pages


Item 4.  Ownership.

     Provide  the  following  information  regarding  the  aggregate  number and
percentage of the class of securities of the issuer identified in Item 1.

(a) Amount beneficially owned:

                    300,660
          ----------------------------------------------------------------------

     (b) Percent of class:

                    10.28%
          ----------------------------------------------------------------------



     (c) Number of shares as to which such person has:

          (i) Sole power to vote or to direct the vote 0


          (ii) Shared power to vote or to direct the vote 216,060


          (iii) Sole power to dispose or to direct the disposition of 0


          (iv) Shared power to dispose or to direct the disposition of 300,660



Item 5.  Ownership of Five Percent or Less of a Class.

         If this statement is being filed to report the fact that as of the date
hereof the reporting  person has ceased to be the beneficial  owner of more than
five percent of the class of securities check the following [ ].


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

Item 6.  Ownership of More Than Five Percent on Behalf of Another Person.

         Clients of the Reporting Person have the right to receive dividends and
proceeds  of the  sale  of the  securities  reported  on this  Schedule.  To the
knowledge of the Reporting  Person,  no such person has an interest  relating to
more than five percent of the class of such securities.

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

Item 7.  Identification and Classification of the Subsidiary Which Acquired  the
         Security  Being  Reported on by the Parent  Holding  Company or Control
         Person.

         Not applicable

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

Item 8.  Identification  and  Classification  of Members of the Group.

         Not applicable

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

Item 9.  Notice of Dissolution of Group.

         Not applicable

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



Item 10. Certifications.

     (a) The following certification shall be included if the statement is filed
         pursuant to Rule 13d-1(b):

         "By  signing  below I certify  that,  to the best of my  knowledge  and
         belief, the securities  referred to above were acquired and are held in
         the ordinary  course of business and were not acquired and not held for
         the  purpose  of or with the  effect of  changing  or  influencing  the
         control of the issuer of the  securities  and were not acquired and are
         not held in  connection  with or as a  participant  in any  transaction
         having such purpose or effect."


     (b) The following certification shall be included if the statement is filed
         pursuant to Rule 13d-1(c):

         "By  signing  below I certify  that,  to the best of my  knowledge  and
         belief, the securities  referred to above were not acquired and are not
         held for the purpose of or with the effect of  changing or  influencing
         the control of the issuer of the  securities  and were not acquired and
         are not held in connection  with or as a participant in any transaction
         having such purpose or effect."





                                    SIGNATURE

     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.


                                         01/24/08
                                        ----------------------------------------
                                                        (Date)


                                         /s/ Lee Unterman
                                        ----------------------------------------
                                                      (Signature)


                                         Lee Unterman, Chief Compliance Officer
                                        ----------------------------------------
                                                      (Name/Title)



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

Attention.  Intentional  misstatements  or omissions of fact constitute  federal
criminal violations (see 18 U.S.C. 1001).