Comparative Anatomy of the Brain. 597 



filiation for mutual assistance and information, :ui advantage due al- 

 most, if not quite, exclusively to the faculty of speech. A bachelor 

 ape, driven away from his family and community, will live alone for 

 years with no other weapons than stones and clubs. Deprive a man of 

 all knowledge of the appliances and inventions made by his fellows, and 



FIG. 331. Inner surface <>f ^**-*""""""" ^"\ i3/ 



cerebral hemisphere of Aye- 

 Aye. ( Monkey?) 



FIG. 332. Inner or septal 

 (mesial) surface of the posterior 

 lobe of the Human Cerebrum. 



turn him out into the wil- 

 derness to shift for him- FIG. 331. 

 self, and he would succeed no better than an 

 ape, probably not so well. But by reason of 

 the faculty of speech, the brain of every man 

 is stored with the knowledge of the doings 

 and discoveries of his fellows, near and far FlG 332 

 away, of the present time and of times long since passed away. The 

 brain of an average educated man in civilized life, is reinforced by a 

 hundred, a thousand or a million others. And what his brain cannot 

 hold of the memories of the discoveries of the others, he can pack awa}' 

 in a library convenient and accessible whenever wanted. Tho aggregate 



FIG. 333. Under surface of 

 left half of Brain of Macacus 

 (Ape). 



FIG. 334. Same in Man. 



of human discovery is 

 enormous and overwhelm- 

 ing. The addition made 

 to the general stock by 

 anyone is infinitesimal. 

 But a cerebrum stored 

 with memories is not en- 

 titled to a separate classi- 

 fication any more than :ui 

 ear that has listened to 

 th<' symphonies of a mas- 

 ter, or a li-g that has gy- 

 rated in tin 1 ma/e of a 

 complicated dance. 



AnioiiLr the "gyren- 



eephala " \ve find the ape 



FIG. 333. Fia.334. and the ho-, between the 



structure of whose brains there is a far greater ditt'erenee than between 

 the ape and man. Compare ivivbnmi of the pig. ii-'. iill, with that of 



