154 

 Conimunications or tne oinstitiit International a Embryologie" 



The I. I.E. has to announce with regret the loss of four of its members by 

 death: Prof. Dr M. FERNANDEZ (Alta Gracia, Argentina), who died 

 April 29th, 1951. Prof. Dr O. GROSSER (Zell am See. Austria), who died 

 in March 1951, Prof. Dr C. J. van der HORST (Johannesburg. South Africa), 

 who died in October 1951, and Prof. Dr A. PENNERS, who died December 

 9th, 1951. 



Prof. Dr E. G. CONKLIN, Princeton, Prof. Dr C. G. HARTMAN, 

 Raritan, Prof. Dr J. GRAHAM KERR, Royston and Prof. Dr P. VINTEM- 

 BERGER, Strasbourg, resigned their membership. 



Prof. Dr G. R. de BEER, London, vice-president to the I. I.E., resigned as 

 a member of the Executive Committee. 



A list of members of the I. I.E. appears in the 1949-issue of the G.E.I.S. 

 (Chapter h, page 176) A new list will be published in the 1952-issue. 



The next general assembly of the I. I.E. will be held in Utrecht, Netherlands, 

 on August 30th — 31st, 1952. At a private meeting the revised draft-regulations 

 will be submitted to discussion, and new members will have to be elected. 

 One or more scientific sessions are planned. 



The general assembly will be preceded by a symposium on August 27th — 

 29th, 1952, which is likewise to be held in Utrecht; it will be organized by 

 the I. I.E. for the International Union of Biological Sciences. The theme of 

 the symposium will be: The biochemical and structural basis of Morphogenesis. 

 The following topics will be discussed: 



1. Biochemistry of oogenesis. 



2. Biochemical and structural changes at fertilization. 



3. Biochemistry of cleavage. 



4. The energetic relationships during embryonic development. 



5. Metabolism and determination. 



6. Submicroscopic structure and determination. 



7. Enzyme differentiations during embryogenesis. 



8. Biochemical development during organogenesis. 



9. Serological methods in the study of morphogenesis. 



The preliminary invitations to the participants of the symposium have been 

 sent out. 



The Secretary, CHR. P. RAVEN. 



Review^ or recently pumisnea textbooks on Embryology 



This year we did not receive any books that could be considered suited 

 for a review. Next year we again hope to receive copies, or suggestions as 

 to titles, of recently appeared textbooks or similar publications with a bearing 

 to embryology or related problems. 



