PHYSIOLOGY OF THE NEKVOUS 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. (Thanhoffer.) 



1, brain of ape: 2. domestic cat; 3. squirrel : 4. water-rat: 5. mole: 6. fox : 7. qnail : 8, nervous sys- 

 tem of horned beetle ; 9, perch ; />/, suprapharyngeal ganglion : h<l. abdominal ganglion : vd, end ganglion ; 

 b, oesophagus: e. nervous cord connecting the pharyngeal ganglion: Crh, cerebrum: <-bl. cerebellum; 

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

 cerebral nerves : wl, vagus ganglion ; br. branchial nerves : 10, nervous system of the snail ; Jy, supra- 

 pharyngeal ganglion ; ag, infrapharyngeal ganglion. 



