PHYSIOLOGY OF THE NERVOUS SYSTEM. 



771 



which vary in accordance with the character of the nerves with which 

 they are in communication. The nerves or nerve-fibres are simply 



Fig. 328.— Brain and Nervous System of Different Animals, Natural 

 Size. (Tlianhoffcr.) 



I, brain of ape ; 2. domestic cat : 3, squirrel ; 4, water-rat ; 5, mole ; fi, fox ; 7, quail ; K, nervous sys- 

 tem of horned beetle ; 9, perch : ft), suprapharyngeal ganglion : h<1, abdominal ganglion ; vd , end ganglion ; 

 o. oesophagus; e. nervous cord connecting the pharyngeal ganglion: C'rb, cerebrum; rbl, cerebellum; 

 tnnbl, medulla oblongata ; olf, olfactory tract : to, optic lobes : Ch, hemispherical lobes ; I-IX (in Fig. 9), 

 cerebral nerves; vd, vagus ganglion ; br. branchial nerves; 10, nervous system of the snail; fg, supra- 

 pharyngeal ganglion ; ag, infrapharyngeal ganglion. 



