io6 Journal of Comparative Neurology. 



ganglion cells of the second type.'' The type two cells have the 

 following pecularity. — The neuraxis of such a cell, breaks up 

 within the ganglion into a large number of branches, which, 

 like the neuraxis, are myelated. These branches soon lose 

 their myelin and terminate in peri-cellular baskets, enclosing 

 the cell bodies of the spinal neurons of type one, the cells com- 

 monly known as spinal ganglion cells. So that, as may be 

 seen, although relatively few sympathetic fibers enter a spinal 

 ganglion, yet through the cells of type two, they may exert an 

 influence over a large number of the typical spinal ganglion 

 cells. 



I may add that Dogiel looks on the sympathetic nerve 

 fibers ending in the spinal ganglia as the neuraxes of sensory 

 sympathetic cells, a type of sympathetic cells which he has de- 

 scribed. These will be further discussed in the next section. 



Finally, I may briefly mention some observations made by 

 the writer (70) and recorded in a short paper on the spinal gan- 

 glia of amphibia. 



In a number of methylen-blue preparations of the spinal 

 ganglia of the large bull-frog, I have observed fine nerve fibers, 

 which are sometimes wound spirally about an axis-cylinder 

 or have a very tortuous course and break up into a network of 

 finer branches, which terminate within the capsule of ganglion 

 cells, from the axis-cylinders of which short processes, w^hich 

 end in disc-like expansions, are given off. I suggest, as an 

 hypothesis, that this network represents the ending of sympa- 

 thetic fibers found in the spinal ganglia of frogs. In some few 

 instances I was able to trace such non-medullated fibers some 

 distance from the cells on which they end, toward a bundle of 

 sympathetic nerve fibers, which seemed to come 'from the distal 

 portion of the spinal ganglion. Peri-cellular baskets have fur- 

 ther been found in the vagus ganglia of the frog, also in the 

 spinal ganglia of chrysemys picta,,a small tortoise examined by 

 me. Such baskets could not however be connected with nerye 

 fibers. 



5. Ending of the neuraxes of sympathetic neurons iti other 

 sympathetic ganglia. — Before discussing this mode of termina- 



