CHAP, vin CONDUCTIVITY AXD EXCITABILITY OF NERVE 



53 



the nerve-trunk. As an instance of the first we need only recall 

 the wealth of ramifications of the single processes of monopolar 





~" V r 



m ! i - 



r- . vO.iiU'-'.r >'/ '^-' .*'. vPv'o^x-.v- 1 -^ - .-iv- , > ,' 



-. 



Pu-^i 



i tp* 





FIG. 15S. Ganglion-cell with richly-developed 

 nerve processes from ventral cord of cray- 

 fish. (Methyl blue and picric acid.) 

 (Biedermann.) 



ganglion-cells in the ventral cord of crustaceans and worms (Fig. 

 158), as well as the " collaterals " from the vertebrate spinal cord. 

 Here the branching obviously forms connection between various 



