Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 EGG CONTAINING A LARGE AMOUNT OF YOLK - BIRDS Fig. 183.—The influence of yolk on gastrulation. (Modified, after Patten: Embry- ology of the Chicly, published by P. Blakiston's Son and Company.)

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