596 Dynamic 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 

 A 



FIG. 329. 



FIG. 329. External surface of left hemisphere of 

 A. Midas. C. Gibbon. 



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



and fox have comparatively few convolutions, and are quite symmetrical 

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



E. Aye-Aye. 

 F. Macacus. 



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 Cuvier long ago observed, man's pre-eminence 

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



