88 ART. 3. — S. IKEDA : CONTRIBUTIONS 



in some instances shifts its position. As already mentioned, the 

 ex-ovates produced from heavy punctures in my materials, may 

 undoubtedly be regarded as fixed point of reckoning. 



This view of Wilson on the second point is, probably, based 

 upon a notion which I believe to be untenable, viz. that every 

 part of the blastopore lip in pricked eggs always grows over the 

 yolk in equal proportion just as in the normally growing v^. 

 For this reason, Wilson's explanation of the result of his 

 experiments 9 and 10 seems rather hard to understand. 



There is no difficulty in reality, I think, in explaining these 

 complex phenomena when we once admit, that inequality in 

 growth in various parts of the blastopore lip may, and does 

 usually, occur in eggs punctured or otherwise experimented upon. 



