Communications of the , Jnstitnt International d* Embryologie" 

 (Embryological Section of the I.U.B.S.) 



The next General Assembly of the I. I.E. will be held on September 20th, 

 1960, in Pallanza (on the Lago Maggiore, Northern Italy). New fellows and 

 members will then be elected. Information as to the procedure of election of 

 new members, as well as the latest list of fellows and members, may be found 

 in the seventh full issue, 1957, p. 206 — 210. 



A Symposium will be held in Pallanza from September 15th till September 

 20th, 1960, which period has been chosen in coordination with the already 

 planned activities of the other sections of the I.U.B.S. The Symposium is 

 organized with the help of an Italian organizing Committee under the presiden- 

 cy of prof. S. Ranzi. It will be open to fellows and members of the I. I.E., but 

 non-members may be invited, either by a fellow or member (see list of fellows 

 and members referred to above), or through the Board of the I. I.E. In the 

 latter case an application for invitation may be sent directly to the Adjunct 

 Secretary, Prof. P. D. Nieuwkoop. 



Non-members may either present a short paper (20 minutes, including dis- 

 cussion), provided that it falls within the scope of the Symposium, or may take 

 part in a panel discussion of specialists in one of the subjects of the Symposium. 



The programme of the Symposium reads as follows: 

 Reception of the participants on Wednesday evening, Sept. 14. 

 Scientific programme and general time schedule: 



ADVANCES SINCE 1945 IN OUR KNOWLEDGE OF GERM CELLS 

 AND EARLIEST STAGES OF DEVELOPMENT. 



Sub-topic A: FORMATION, ULTRASTRUCTURE AND PHYSIOLOGY 

 OF OOCYTES, AS SEEN IN THE LIGHT OF THEIR MORPHO- 

 GENETIC SIGNIFICANCE 



Subject a) Relations with the maternal organism 

 chairman: Prof. Chr. P. Raven (Utrecht) 

 main speaker: Miss B. Mintz (Chicago, 111.) 1 ) 



Subject b) Progressive changes in structural and biochemical composition 

 chairman: Prof. C. H. Waddington (Edingburgh) 

 main speaker: 



Subject c) Polarity and bilateral symmetry 

 chairman: Prof. J. Pasteels (Brussels) 

 main speaker: Prof. Ch. Devillers (Paris) 



Evening lecture on "Biochemistry and physiology of sperm" 

 by Dr. T. Mann (Cambridge) 



The opening session of the Symposium, the subjects a, b and c and the first 

 evening lecture will be held on Thursday, Sept. 15. 2 ) 



*) The titles of the individual reports will be announced later. 



2 ) Each morning session will comprise about V/i hours and each afternoon session about 

 2 hours. 



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