FERTILIZATION OF THE FROG'S EGG 



129 



sists of a fresh sperm suspension into which eggs from the same female are stripped, sim- 

 ultaneously with the stripping into the experimental sperm suspensions. 



Tahulate the data as follows : 



Indicate total number of eggs/ number cleaving = percentage 



EEFERENCES : 



Bataillon, E. & Tchou-Su, M., 195^* - "L'analyse experimentale de la fecondation et sa 



definition par les processes clnetiques." Ann. des Sc. Nat. Zool. 1?: 

 Brooke, M. M., 19^+7 - "Activation of eggs by oxidation- reduction indicators." Science. 



106: (Oct. 3). 

 Clark, J. M., 1936 - "An experimental study of polyspemny. " Biol. Bull. 70:360. 

 Costello, D. P., 191+0 - "The fertllizability of nucleated and non-nucleated fragments of 



centrifuged Nereis eggs." Jour. Morph. 66:99. 

 Dalcq, A., I928 - "Les Bases Physiologiques de la Fecondation." Paris. 

 Fankhauser, G-. & C. Moore, 19^+1 - "Cytological and experimental studies of polyspemcr in 



the newt, Triturus viridescens." Jour. Morph. 68:3l*-7. 

 Llllie, F. B., 1919 - "Problems of Fertilization." Univ. Chicago Press. 

 Luyet, B. J., I9I+I - "Life and death at low temperatures." Biodynamlca, Normandy, Mo. 

 Schaffner, C. S.. I9I12 - "Longevity of fowl spermatozoa in frozen condition." Science. 



106:(0ct, 9). 



(See section on Artificial Parthenogenesis) 



"The organism and the env ir onment inter pene tr at e one 

 another through and through - the dis t inc t ion between them 

 is only a matter of convenience . 



F. N. Sumner 1922, Sc. Monthly li:233 



