Archive image from page 33 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 1 r D o F Fig. 11.—Extrusion of first polar body and fertilization of egg of Toad. (From preparations made by Helen D. King.) A. First polar spindle. B. First polar body extruded; second jjolar spindle present. C. Entrance of spermatozoon. D. Male and female pronuclei. E. Apposition of two pronuclei. F. First seg- mentation-spindle. point of the surface of the Qgg. This protrusion of protoplasm with its enclosed h

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Archive image from page 33 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 1 r D o F Fig. 11.—Extrusion of first polar body and fertilization of egg of Toad. (From preparations made by Helen D. King.) A. First polar spindle. B. First polar body extruded; second jjolar spindle present. C. Entrance of spermatozoon. D. Male and female pronuclei. E. Apposition of two pronuclei. F. First seg- mentation-spindle. point of the surface of the Qgg. This protrusion of protoplasm with its enclosed half of the nucleus gradually pinches off from the surface of the egg, and there is thus formed the first polar body (Fig. 11, B). The egg gets a thin layer of gelatinous

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