Archive image from page 73 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 GP SP .GP Fig. 20. —Surface views of young embryo of Rana. (After Schultze.) IM. Inner medullary plate. EM. Outer medullary plate. GP. Gill-plate. SP. Sense-plate. BP. Blastopore. A later stage is shown in Fig. 20, D. Here the sense-plate is fonnd to have extended laterally and forward, and the two

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