PREDOMINANCE OP THE NERVOUS SYSTEM. 



85 



of the remaining blood, by far the largest portion is transmitted 

 to the muscular system, which is the instrument of the nervous 

 apparatus, in producing the movements of the various parts of 

 the body. To prepare this blood, and to keep it in a state fit 

 for the due performance of its func- a 



tions, a complex digestive, respiratory, 

 and secreting apparatus is requisite; 

 but this vegetative part of the fabric 

 does not live for itself alone, as it 

 seems to do in Plants, and (almost to 

 the same extent) in Zoophytes, and the 

 inferior Mollusks ; for it is entirely 

 subservient to the maintenance of the 

 functions of animal life, by keeping the 

 nervous and muscular systems (toge- 

 ther with the bony frame-work, and 

 other parts connected with the move- 

 ment of the body) in a state of good 

 repair. 



63. The nervous system of Verte- 

 brata cannot, as a whole, be properly 

 compared with that of Invertebrate 



Fio 41. BRAINS or FISHKS. A, Cod ; B, Shark. 



FIG. 40. BRAIN AND SPINAL 

 CORD OF MAN ; a, cere- 

 brum ; b, {interior lobe ; c, 

 middle lobe ; d. posterior 

 lobe; e, cerebellum ; /.me- 

 dulla oblongata ; Jf, spinal 

 cord. 



animals, unless we look at its lowest forms. In Mi u, we find 



