59 



currence of impressions and actions. In 

 some of these animals no traces of nerves 

 subservient to the voluntary regulation 

 of their motions can be found. In 

 the ascending complexity of the nervous 

 system, we find a nervous chord more 

 or less beset with ganglia, which supplies 

 otjier parts of the body besides the vis- 

 cera, and which probably serves to main- 

 tain amongst them likewise a concurrence 

 of impressions and actions. We next 

 find at one end of this chord a kind of 

 ganglion, or brain, which gradually becomes 

 larger and more complex as we trace 

 the series of links upwards to man, in 

 whom it bears a much larger proportion 

 to the nervous system in general than 

 in any other animal. The visceral nerve, 

 in the ascending series of animals, ap- 

 pears connected with the anhnal nerves; 

 and so numerous are these connections 

 that this nerve has in the human subject 



