Archive image from page 48 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 G H I Fig. 12.—Segmentation of esg and formation of blastopore (H, I). A. Eight-cell stage. B. Beginning of sixteen-cell stage. C. Thirty-two-cell stage. D. Fortj'- eight-cell stage (nnusually regnlar). E, F. Two sides of same egg in later cleavage. G. Still later cleavage. H. Dorsal lip of blastopore. I. Circular blastopore (with lower pole toward observer). the protoplasm of the egg, dividing the contents into two

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Archive image from page 48 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 G H I Fig. 12.—Segmentation of esg and formation of blastopore (H, I). A. Eight-cell stage. B. Beginning of sixteen-cell stage. C. Thirty-two-cell stage. D. Fortj'- eight-cell stage (nnusually regnlar). E, F. Two sides of same egg in later cleavage. G. Still later cleavage. H. Dorsal lip of blastopore. I. Circular blastopore (with lower pole toward observer). the protoplasm of the egg, dividing the contents into two parts. When the superficial furrow has encircled the egg., the substance also has been divided. D

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