lllb.4. 



150 nib. 7. 



G. Behaviour and importance of Potassium during fertili- 

 sation of the sea urchin egg. Paracentrotus and Ar- 

 bacia . Mrs A. MONROY— ODDO 



G. Study of the importance of the phosphorylated com- 

 pounds in the energetic changes accompanying activa- 

 tion of the eggs. Strong ylocentrotus purpuratus and 

 Dendraster excentricus. A. H. WHITELEY 



I The influence of the short wave radiation of the 

 fertilization in Amphibia. J. PIOTROWSKA 



J. The ultraviolet- and X-rays influence on spermatozoa 

 under various experimental conditions. Rana temporaria. 



H. G. GODLEWSKI 



L Artificial inseminations with semen stored in different 

 conditions. Gallus domesticus. J. H. MARCHLEWSKI 



M. Place of fertilization of the mammalian egg. Rodentia 1. 4. 



and Carnivora. F. STRAUSS 



(under direction of H. W. MOSSMANN) 



Parthenogenesis. 



J. Initiation of artificial parthenogenesis in frog eggs. 

 Rana fusca (Anuta). J. R. SHAVER 



J. An analysis of the "second factor" in the first cleavage 

 in the artificial parthenogenesis of the frog egg. Rana 

 pipiens and R. palustris. Ch. L. PARMENTER 



M. Mammalian parthenogenesis. Lepus cuniculus. 



H. SHAPIRO 



5. Cleavage. 



6. Gastrulation. 



J. The cumulative of oxygen-pressure and the production 1. 6. 



of various degrees of blocking of the processes of gas- 

 trulation in the embryo of the frog, Rana pipiens. 



O. E. NELSON 



7. Neurulation (including development of neural crest). 



J. The reactive capacity of Rana nigro-maculata to abnor- Ilia. lc. 

 mal inductor seems to be weaker than that of Triton. Ilia. 7. 



In order to find out whether the ectoderm of Rana is Illb. lc. 

 less sensitive to inductive stimuli Holtfreter's experimen- 

 tal method (1947) was adopted. Isolated gastrular 

 ectoderm of Rana was given a treatment with acid and 

 alkali solution of various concentration for various 

 length of duration. Thus it will be found whether the 

 ph ranks which cause neural differentiation in Triturus 

 (or Amblystoma) and in Rana ectoderm are different. 

 Furthermore, the cause why Triturus and Rana ecto- 

 derms react differently to the same ph rank will also 

 be studied. Y. K. LIAO 



