Chap. I.] 



EMBRYONIC DEVELOPMENT. 



15 



Fig. 1.— Upper figure human embryo, from Ecker. Lower figure that of a dog, 



from Bischoff. 



a. Fore-brain, cerebral hemispheres, 

 etc. 



b. Mid-brain, corpora quadrteemina. 



c. Hind-brain, cerebellum, medulla 

 oblongata. 



d. Eye. 

 c. Ear. 



f. First visceral arch. 



g. Second visceral arch. 



H. Vertebral columns and muscles in 

 process of development. 



L. Tail or os coccyx. 



