306 



THE EVOLUTION OF MAN. 



loped. Finally, in the Horse, only one digit, the third, is 

 perfectly developed (Fig. VI., 3). And yet all these diverse 

 fore-feet, as also the hand of the Ape (Fig. 271) and the 

 human hand (Fig. 272), have originated from the same 

 common five-fingered parent-form. This is proved, not only 

 by the rudiments of the aborted digits, but also by the 

 homologous disposition of the wrist-bones (Fig. 273, a-p). 

 (Vide supra, p. 124.) 



The same story is also told by the germ-history of the 

 limbs, which is originally identical, not only in all Mammals, 

 but in all Vertebrates. However different the limbs of the 

 various Skulled Animals (Craniota} afterwards appear in 

 their fully developed state, they nevertheless all originate 

 from the same simple rudiment. (Cf. Plates VI. and VII., 



FIG. 273. Skeleton of hand or fore-foot of six Mammals. I. Man; II. 

 Dog; III. Pig; IV. Ox; V. Tapir; VI. Horse, r, Radius; u, ulna; 

 a, scaphoid; 6, semi -lunar ; c, triqnetrnm (cuneiform); d, trapezium; e, 

 trapezoid ; /, capitatum (unciform process) ; g, hamatum (unciform bone); 

 p, pisiform; 1, thumb; 2, digit; 3, middle finger; 4, ring finger; 5, little 

 finger. (After Gegenbaur.) 



