506 iJynwmic Theory. 



velopment of the convolutions with the catarrhine apes. In those an- 

 imals which have the greatest number of convolutions, there is a greater 

 or less want of symmetry between the two hemispheres. In general 

 terms, the fewer convolutions, the greater the symmetry. Thus the cat 



FIG. 329. 

 ' FIG. 329. External surface of left hemisphere of 



A. Midas. C. Gibbon. E. Aye-Aye. 



B. Callithrix. D. Human foetus ( 5 mo.). F. Macacus. 



and fox have comparatively few convolutions, and are quite symmetrical 

 as compared with the horse, the dolphin, the ape, or man. 



FIG. 330. 



FIG. 330. Convolutions of Brains of Monkeys, Apes and Man. 



A. Midas. C. Macacus. E. Human foetus, 3 mo. G. Cebus. 



B. Callithrix. D- Human foetus, 7 mo. F. Lemur. H. Chimpanzee. 



J. Adult Man. ( Owen.) 



Owen places man in a separate sub-class, which he calls Archen- 

 cephala, or "governing brain." If man's works are to be regarded as 

 a criterion by which to judge the quality of his brain, this class distinc- 

 tion is justifiable. But, as Cuvierlong ago observed, man's pre-eminence 

 is due not so much to his individual superiority as to his faculty of coin- 



