ANIMAL MECHANICS. 



411 



These Tables show — 



i°. The deficiency of grasping power in feet as compared 

 with hands. 



2° The enormous developement of the walking power in 

 the foot of Man. 



These results possess considerable interest when taken in 

 conjunction with the results previously obtained by me, in 

 discussing the differences in the flexor tendons of the hand 

 and foot. It may be worth while to note, in connexion with 

 the exceptional position of the Llama, p. 134 (which proves 

 that the hand of this animal is a true foot), that the propor- 

 tions of the walking and grasping muscles completely confirms 

 this view. 



Walking Grasping 

 Power. Power. 



Llama (Hand), . . . 100 90.3 



Taking, as before, the walking muscles of the hand as our 

 standard of comparison, we find the following proportions for 

 the extensors of the wrist : — 



Comparison of Walking and Extending Muscles in the Wrist of 

 Mn and the Quadrumans. 







Walking- 

 Muscles. 



Extensors 

 of Wrist. 





Man, . , . . 



100 



'35-7 



1. 



Goriila, . . . 



100 



171 0 



3- 



Chimpanzee, . . 



100 



89-5 



4- 



Hamadryas, . 



100 



58.8 



5- 



Oyn 'inolgus, . 



100 



100. 0 



6. 



Mandrill, . . . 



100 



88.2 



7- 



Rhesus, . . . 



100 



7*-5 



8. 



Ateles, .... 



ICO 



81.2 



The next example of muscular type that I shall give, is 

 the remarkable case of the hind limbs of the Struthionidat, 



