Archive image from page 90 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 r B — Fig. 27. — Two embryos formed as rings arouud equator of egg. A. Seen from iu front (jjrodueed in salt solution). (Morgan.) B. Seen from side. (After Roux.) normal development. An embryo described by Roux iis shown in Fig. 27, B. Around the equator of the eg along the zone between the white and black hemispheres is a thickened ridge. A careful examination shows that this ridge is not uniform in thickness, but is
Archive image from page 90 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 r B — Fig. 27. — Two embryos formed as rings arouud equator of egg. A. Seen from iu front (jjrodueed in salt solution). (Morgan.) B. Seen from side. (After Roux.) normal development. An embryo described by Roux iis shown in Fig. 27, B. Around the equator of the eg along the zone between the white and black hemispheres is a thickened ridge. A careful examination shows that this ridge is not uniform in thickness, but is bilateral in form. Each half is somewhat thickened at one end, and resembles half of the medullary plate of the normal embryo. Cross-sections (Fig. 29, B) show that these ridges around the equator of the egg are the two halves of the medullary plate. Instead, however, of being in close 75
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