Archive image from page 48 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 THE EGG 31 known if maturation in birds may be completed without fertiliza- tion, but it seems probable that, as in many other animals, the completion of maturation is dependent on the stimulus of fertiliza- tion. It is, however, essentially a process absolutely distinct from fertihzation, and in some animals {, echinids) is com- pleted without fertilization.

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