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PLATE 31 



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Ovolysis — Eggs of Asteria vulgaris. 



I, Normal unfertilized egg. 2, Action of 1 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. 



(Drawinge by Noguchi.) 



