. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Pig. 100.—Transverse section through the medullary groove and half the blastodermof a chick of eighteen hours (Foster and Balfour). E, epiblast; M, mesoblast;//, hypoblast; mf, medullary fold; my, medullary groove; ch, notochord. endeavor to make this prominent in the future chapters of thiswork. Being prepared with these generalizations, we continue ourstudy of the development of the birds embryo. Before the end THE DEVELOPMENT OP THE EMBRYO ITSELF. 99 of the first twenty-four hours s
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Pig. 100.—Transverse section through the medullary groove and half the blastodermof a chick of eighteen hours (Foster and Balfour). E, epiblast; M, mesoblast;//, hypoblast; mf, medullary fold; my, medullary groove; ch, notochord. endeavor to make this prominent in the future chapters of thiswork. Being prepared with these generalizations, we continue ourstudy of the development of the birds embryo. Before the end THE DEVELOPMENT OP THE EMBRYO ITSELF. 99 of the first twenty-four hours such an appearance as that repre-sented in Fig. 100 is presented. The mounds of cells forming the medullary folds are seencoming in contact to form the medullary {neural) Fig. 101.—Transverse section of embryo chick at end of first day (after KOlliker). M,mesoblast; H. hypoblast; m, medullary plate; E. epiblast; m. g, medullary groove;, medullary fold; ch, chorda dorsalis ; P, protovertebral plate; d. in. divisionof mesoblast. The notochord, marking out the future bony axis of thebody, may also be seen during the first day as a well-markedlinear extension, just beneath the medullary groove. The cleav- nf fif
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