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THE AMERICAN NATURALIST [Vol. XL VII 



tion stage (Fig. 4) shows two polar bodies and the male 

 and female pronnclei lying close together in the 

 thickest part of the formative zone. There is nothing 

 in maturation nor in fertilization to suggest or account 

 for polyemhryony. Their chief evidential value lies in 

 the fact that they demonstrate the fact of poly- 

 emhryony and show that the latter is not due to any 



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