300 



HISTORY OF THE HUMAN BODY 



modifications through the compensation furnished by other 

 factors, such as the special devices just considered. Thus in 

 the ox the length of the entire intestine, small and large, in 

 proportion to the length of the body taken as unity is 20:1, 



FIG. 84. Colon labyrinth of Propithecus diadema. [From WEBER, 

 after VAN LOGHEM.] 



while in the horse, which eats similar foods, it is but 12:1, but 

 in this latter animal an enormously developed coecum furnishes 

 a compensation for the reduction in length of the main canal. 

 Perhaps the greatest extremes of variation within the same 

 Order are shown within the limits of the Cetacea, where the 

 proportionate length varies between 4:1 and 32:1. This last, 



