THE HUMAN FOOT 



75 



length of foot behind the base of the great toe than there 

 is of hand behind the base of the thumb (see Fig. 28). 



This posterior elongation of the foot or development 

 of a heel is present also in many monkeys. The big toe 

 of the Gorilla is larger and better developed than the 



FIG. 27. THE LEFT TOOT OF Cercopithecus palatinus SEEN 

 FROM ITS PLANTAR ASPECT. 



FIG. 28. PLANTAR SURFACE OF THE LEFT FOOT OF A YOUNG 



GORILLA. 



With details of the cutaneous markings, after Duckworth, from 

 a specimen in the Cambridge Collection. 



thumb ; the remaining toes are not so well developed as 

 the corresponding fingers ; nevertheless, they retain exactly 

 the same relative proportions. We may speak of a 

 digital formula for hand and foot, such a formula being 

 an expression of the relative degree of projection of the 



