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Experiment Station, Ithaca, New Y o r k FOUR FIGURESThe most important constituents of the bird's egg are yolk and albumen. They furnish almost all the necessary food to the developing embryo throughout the entire period of incubation, and a considerable portion of yolk is used after the bird has been hatched. Therefore, it is generally assumed that during the incubation of the bird's egg the gross assimilation of the yolk and albumen is directly proportional tci the growth of the embryo and to the exercitation of energy by the developing embryo.

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