Chap. I. 



EMBRYONIC DEVELOPMENT. 



15 



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



f'om Bischoff. 



a. Fore-brain, cerebral hemispheres, &c. 



b. Mid-brain, corpora quadrigemina. 



c. Hind-brain, cerebellum, medulla ob 

 longata. 



d. Eye. 



e. Ear. 



/. First visceral arch. 



g. Second visceral arch. 

 H. Vertebral columns and muscles in 

 process of development. 

 i. Anterior ) 

 K. Posterior } extremities. 



L. Tail or os coccyx. 



