86 CLASS MAMMALIA. 



ness of locomotion he is much inferior to other 

 animals of not greater dimensions. He has neither 

 projecting jaws, nor protruding canine teeth, nor 

 nails extended into claws or talons, and is con- 

 sequently destitute of offensive weapons. He is 

 also almost without defensive arms, as the sides 

 and upper part of his body are literally naked, not 

 being furnished even with a covering of hair. Above 

 all, he is the longest of all living beings in arriving 

 at the full maturity and entire possession of all his 

 faculties and energies, or even in acquiring suf- 

 ficient force for his own preservation, subsistence 

 and defence. 



But he derives additional strength from his very 

 weakness. His external deficiencies oblige him to 

 look within, and to have recourse to that intelli- 

 gence with which nature has endowed him in so 

 eminent a degree. 



No quadruped is comparable to man for the rritig- 

 nitude of the hemispheres of the brain, that is, of 

 the part of this organ which serves as the principal 

 instrument of the intellectual operations. The hin- 

 der part of the same organ extends so as to form 

 a second covering for the cerebellum. The very 

 form of the cranium announces this magnitude of 

 the brain, while the comparative smallness of the 

 face displays how little that part of the nervous 

 system which influences the external senses is pre- 

 dominant in the human species. 



These external sensations which are less energetic 



