56 



that every nervous filament communicates 

 distinctly with the brain or some process 

 of that organ. 



This apparent continuity is, however, 

 lost, whenever we find those intumescences 

 on nerves which are caHed ganglia, for 

 in these ihere seems to be a mixture or 

 consolidation of the nervous matter. It 

 is also lost wherever various nerves unite 

 together, and form a plexus; in which 

 case the nervous fibrils either coalesce, 

 or become inextricably interwoven with 

 one another. 



The nerve from which the thoracic and 

 abdominal viscera are chiefly supplied, 

 is beset with numerous ganglia and 

 plexuses; and as we cannot by our 

 will influence the actions of those viscera, 

 and as the iris, the motions of which 

 are also involuntary, is supplied with 



