11 



The programme of the Conference was arranged in two morning sessions and 

 two afternoon sessions daily, and two additional evening sessions. One after- 

 noon was reserved for four parallel sessions devoted to contributed papers 

 (38 in total). 



After introductory addresses by Dr. Ebert and Dr. Markert. the Conference 

 was opened by the president of the I. I.E., Prof. Et. Wolff (Paris). Each session 

 had a main speaker and a discussant. The following topics were treated in the 

 sessions: The genetic basis of development; Chemical differentiation; Histo- 

 genesis; Various aspects of the development of the central nervous system; 

 Aspects of limb morphogenesis; Various aspects of sexual differentiation; Or- 

 ganogenesis of placenta; Development of lymphoid system. At the end of the 

 Conference Dr. Ebert presented the concluding remarks, and Prof. Wolff gave 

 a summarizing lecture. 



The Conference was attended by more than 300 participants. Among these 

 75 came from outside the U.S.A. The I. I.E. was represented by 81 members. 



A General Assembly of the I. I.E. was held at the end of the Conference in 

 Baltimore, on September 12, 1964. At the General Assembly a number of im- 

 portant decisions have been taken. 



1 ) The proposal of the Board to abolish the distinction between fellows and 

 members has been accepted unanimously, so that from now on the I. I.E. only 

 has ordinary members, emeritus members and supporting members. 



2) In order to meet the rapidly increasing needs of cooperation among embryo- 

 logists an extension of the Board with two more members has been effectuated. 

 Five Board members have been re-elected and four new members have been 

 elected. The composition of the Board for the next term will be as follows: 



E. Wolff (Paris) President 



S. Horstadius (Uppsala) Vice president 



S. Ranzi (Milano) 



T. Yamada (Oak Ridge, Tenn.) 



M. Abercrombie (London) Member 



J. D. Ebert (Baltimore, Md. ) 



J. J. Pasteels (Brussels) 



E. Zwilling (Waltham, Mass.) 



A. Monroy (Palermo) Secretary-treasurer 



P. D. Nieuwkoop (Utrecht) Adj. secretary-treasurer 



3) After a lively discussion concerning the procedure of election of new mem- 

 bers, and regarding the standards for membership, the following proposals have 

 been accepted: a) Candidates for membership can be proposed by two members 

 ar any time. The Board has been authorised to screen the applications at regular 

 intervals and to decide about their acceptance by simple majority of votes 

 among its members. It has been envisaged to screen applications once a year, 

 b) The standards for membership have been slightly revised and are now as 

 follows: Persons who have made a substantial contribution to the field of devel- 

 opmental biology can be accepted as members. It is left to the Board to decide 

 whether a particular applicant meets this standard. 



