NOGUCHI 



PLATE 31 



T--5e. 



5 



-!Ji/- 



A:° iC:-/ 



[t-S'^ 



10 



1 1 



12 



/rm^'^ 



13 



15 



Ovolysis — Eggs of Asteria vulgauls. 



1 , Normal unfertilized egg. 2, Action of I per cent Cobra or 2 per cent Moccasin venom. 



3, Result of complete Ovolysis by these venoms in 6 hours. 4, Action of 2 per cent 



Crotalus venom in 6 hours. 5, Normal egg with polar body formation. 6, Ovolysis 

 by venom. 7 to 15, Ovolytic effects of venom upon fertilized eggs. 



(Drawings by Noguchi.) 



