. The development of the chick; an introduction to embryology . the arches surrounding the primary, is not a clear onein the case of the chick. On the seventh and eighth days the process of chondrifica-tion extends into all parts of the vertebra; the entire vertebrais, in fact, laid down in cartilage on the eighth day, although theneural spine is somewhat membranous. Fig. 237 shows theright side of four trunk vertel)rae of an eight-day chick, preparedaccording to the methylene Hue mothotl of \an Wijhe. The Fig. 236. — Frontal soction of the vortclirul column and neighboring struc-tures of a ()

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. The development of the chick; an introduction to embryology . the arches surrounding the primary, is not a clear onein the case of the chick. On the seventh and eighth days the process of chondrifica-tion extends into all parts of the vertebra; the entire vertebrais, in fact, laid down in cartilage on the eighth day, although theneural spine is somewhat membranous. Fig. 237 shows theright side of four trunk vertel)rae of an eight-day chick, preparedaccording to the methylene Hue mothotl of \an Wijhe. The Fig. 236. — Frontal soction of the vortclirul column and neighboring struc-tures of a ()-(lay chick. Ippcr thoracic rc,i;;ioii. Note separate centersof chondrification of the neiu-al arch, centrum, and costal processes. .Vn-tcricir end of section at) n. . Base of neural arch. br. N. 1, 2, 3, First, second, and thirdbrachial nerves. Cp- I^-> Ca|)itulum of rib. iv. D., Intervertebral , Muscles. N. -V-. Xreviatioiis as Ixfore. THE SKELETON 419. -/r^. -3y7K^ &^-

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Keywords: ., bookcentury1900, bookdecade1900, bookiddevelopm, booksubjectbirds