Archive image from page 57 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 40 THE DEVELOPMENT OF THE CHICK 1 Fig. 16. — Five stages of the cleavage of the hen's egg. (A, B, D and E after KolUker; C after Patterson.) A. First cleavage furrow (x 14). The egg came from the lower end of the oviduct. B. Four-celled stage (x 17); from the uterus. C. Eight-celled stage (x 18). D. Nine central and sixteen marginal cells (x about 16). E. Late cleavage stage (x about 22).

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