C1I. XV.] 



CHEMISTRY OF NERVE 



175 



alteration may produce different consequences at different places ; 

 the electric change, however, in the wires would be the same in all 

 cases. So the nerve impulse going along a nerve is always the same 

 sort of molecular disturbance; if it is made as in the experiment 

 just described, to go by a wrong channel, it produces just the same 



Superior 

 Ceruical 

 Ganglion 



i 



! 



npat 



A, the two nerves are shown intact ; the direction of the impulses they normally carry is shown by 

 arrows, and the names of some of the parts they supply are mentioned. In B, both nerves are cut 

 through. The degenerated portions are represented by discontinuous lines. In C, the union 

 described in the text has been accomplished, and stimulation at the point a' now produces the same 

 results as were in the intact nerves (A) produced by stimulation at a. 



results as though the impulse had reached its destination by the 

 usual channel. 



Chemistry of Nervous Tissues. 



The following table gives some typical analyses of the solids of nervous tissues, 

 but these tissues also contain a large amount of water ; this is present in larger 



