THE DESCENT OF MAN. 



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

 of a dog, from Bischoff. 



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



b. Mld-braJn, corpora quadrlgemina. 



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, 

 i. Anterior extremity. 

 K. Posterior extremity. 

 L. Tail or OS coccyx. 



