Illb. 2c.c. M8 nib. 4. 



Nutrition of embryo (g). 

 Immunological studies (h). 

 J. Immunological characteristics of embryonic cytoplasmic 

 granules. Rana fusca (Anura). J. R. SHAVER 



Early development. 



3. Implantation, placentation and development o[ fetal membranes. 



M. Implantation of fertilized rabbit ova in the uterus. 



J. W. BARENTS 

 M. Study of egg transport and implantation; early develop- 

 ment of trophoblast; embryo-maternal relationships 

 during nidation. Mus. R. H. ALDEN 



M. Permeability of the placenta in rat and guinea-pig. In- 

 vestigation with isotopes. 



J. DANKMEYER and C. B. HEYN 

 M. Placental transfer. Common laboratory mammals. II. 3. 



L. B. FLEXNER 



4. Ovogenesis, spermatogenesis, structure of egg and sperm, 

 maturation, oviposition, fertilization (activation, parthen- 

 ogenesis). 



Ovogenesis. 



B. Cytochemical studies upon the ovogenesis of coelen- 1.4. 

 terata. Amelia aurita. H. G. GODLEWSKI 



J. Ricerche sul comportamento degli acidi nucleici durante 



1'oogenesi. Amphibians. E. URBANI 



L. Egg formation in birds. (Role of female hormone in Ilia. 4. f. 



vitellogenesis). Pigeon, duck and chick. J. CLAVERT 



Structure of egg and sperm, 

 G. Continued studies on the "dorsoventral" (oral-aboral) 



organization of the unfertilized sea urchin egg. Echino- 



cavdium cordatum and other sea urchins. 



T. GUSTAFSON 

 G. On the origin and nature of the precursors of egg- Ilia. 4. 



membranes in echinoidea. Dendraster excentricus and 



Strongylocentrotus putpuratus. A. R. MOORE 



G. Studies on the proteins of unfertilized and the first 



stages of fertilized sea urchin eggs. S. LINDVALL 

 G. The biochemical mechanism of the animalization of the Illb. lc-b. 



unfertilized sea urchin egg. P. E. LINDAHL 



H. Study of the cortex of Ascidian eggs. S. LEGHISSA 



J. fetude dn revetement superficiel de l'oeuf. Tritirus hel- 1.4. 



veticus. Tr. alpestris et Tr. cristatus. A. DOLLANDER 

 I. Physiologie des Knochenfischspermas. A. ROETHELI 



Meiosis. 



C. Chemische Beeinflussung der plasmatischen Vorgange 

 der Meiose bei Tubifex. A. ROETHELI 



