294 



THE BRAIN OF QUAD RUM AN A. 



These latter folds become further developed in the Orang, 

 and still more so in Man. 



In the Baboon, the Convolutions, as may be seen from 

 fig. 114, are pretty distinctly defined on the Frontal and 

 Parietal Lobes, and they are also more distinct on the 

 Occipital than they have been in either of the forms 

 previously mentioned. The Frontal Lobes, too, are fuller 

 and less pointed than they are in lower terms of the series. 



We may now pass to a brief consideration of the Brain 



in the highest representa- 

 tives of the Quadrumana at 

 present existing, viz., the 

 three great ' man-like ' 

 Apes the Chimpanzee, the 

 Gorilla, and the Orang. 



No differences in the 

 brain characters of these 

 animals have been found 

 sufficiently marked in 

 amount or in nature to 

 enable us to say that one 

 of them is very unmistak- 

 ably higher than the others. 



FIG. 114.- Brain of the Baboon (Cynoce- * ' 



pha/us papio), upper aspect. (Vrolik, after bome distinguished ana- 

 Leuret.) Compared by Leuret to the Brain j. fKmirwpfl to 



of a Human Foetus of 6-7th month, in regard W 



to its convolutional development. F, Frontal think that the brain (liav- 

 Lobe ; O, Occipital Lobe. . -, , , , 



ing regard to the sum total 



of its characters) of the Chimpanzee is the simplest, and 

 that of the Orang the most highly developed. Others, how- 

 ever, give the first place to that of the Gorilla. 



The brain of a Chimpanzee was carefully described and 

 figured in 1861 by Prof. Marshall.* The animal was not 

 * "Nat. Hist. Eeview," vol. i. p. 296. 



