Fig. 1. Upper figure human embryo, from Ecker. Lower figure that of a dog, from Bischoff.
a. Fore-brain, cerebral hemispheres, &c. b. Mid-brain, corpora quadrigemina. c. Hind-brain, cerebellum, medulla oblongata. d. Eye. e. Ear. f. First visceral arch.
g. Second visceral arch.
H. Vertebral columns and muscles process of development.