THE BRAIN OF APES AND OF MAN 261 



change more or less widely exhibited among later animals, 

 as compared with their near relatives in the past when 

 we establish the fact that the brain of the man-like apes 

 is much bigger than that of lower monkeys, and that the 

 brain of man, who is so closely similar in all structural 

 details to those apes, has attained to a bulk three times 

 that of the ape.- The vast increase in the size of the 

 brain in recent animals, as compared with their closely 

 related representatives of an earlier period, is a frequent 

 and regular thing. It is possible to make a suggestion, 

 of some plausibility, as to the meaning and value of this 

 increased size of brain, which will be found in the next 

 chapter. 



