. The development of the frog's egg; an introduction to experimental embryology. Embryology. Fig. 35. —Cross-sections through two half-embryos of different stages. (After Roux.) notochord and archenteron, which are also median structures, form whole structures but of smaller size than the correspond- ing normal organs. Roux thought that the notochord was very probably composed of only half the number of cells pres- ent in the normal notochord, but, owing to a great amount of variation in the latter, it was not possible to determine this relation definitely. Pfliiger, Roux, and Born have shown
. The development of the frog's egg; an introduction to experimental embryology. Embryology. Fig. 35. —Cross-sections through two half-embryos of different stages. (After Roux.) notochord and archenteron, which are also median structures, form whole structures but of smaller size than the correspond- ing normal organs. Roux thought that the notochord was very probably composed of only half the number of cells pres- ent in the normal notochord, but, owing to a great amount of variation in the latter, it was not possible to determine this relation definitely. Pfliiger, Roux, and Born have shown that sometimes in the normal development the plane of the first cleavage corresponds to the cross-plane of the body of the embryo, the plane of the first cleavage separates the anterior from the posterior end of the body. Under these circumstances, if one of the lirst two. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Morgan, Thomas Hunt, 1866-1945. New York, The Macmillan company; [etc. , etc. ]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectembryology, bookyear1
