HuBER, Sympathetic Netvous System. 109 



the figure, the end-branch of the non-medulated fiber terminates 

 in several very small nodular enlargements. 



The fiber thus ending did not seem to enter the ganglion 

 from the periphery, or, to state it in an other form, did not seem 

 to be the termination of a neuraxis, a part of a sympathetic 

 neuron, situated distal to the ganglion in which said ending was 

 found. I am free to admit, that in sections such orientation 

 becomes a matter of extreme difficulty. Yet, in larger ganglia, 

 studied as a whole, even when cleared in glycerine, and espec- 

 ially if the ganglion is at all well stained, the tracing of nerve 

 fibers and the recognizing of their mode of ending is to me a 

 task more beset with difficulties and more open to misinterpre- 

 tation. Hence the reason for studying the larger ganglia in 

 sections. I may say that the observation here presented is not 

 unique, but has been met with many times. Whether the free 

 ending on the dendrites of sympathetic cells, is to be looked 

 upon as the ending of neuraxes of sensory sympathetic neurons, 

 in the sense suggested by Dogiel, I am unable to say. I would 

 suggest, however, as an hypothesis, the possibility of a similar 

 ending for the neuraxes of sympathetic neurons, situated cen- 

 tral to the ganglion in which they end, neurons not sensory in 

 their nature. This point will, however, as above stated, be 

 taken up again. 



Ending- of cerebrospinal nerve fibers in the sympathetic ganglia. 

 — In methylen-blue stained sympathetic ganglia there are al- 

 ways found a varying number of medullated nerve fibers. Some 

 of these medullated fibers pass through the sympathetic gan- 

 glia, without in any way making connection with the sympa- 

 thetic nerve cells contained therein ; these are in all probability 

 sensory, cerebrospinal fibers, and will be discussed at a future 

 time. Other medullated fibers terminate in the sympathetic 

 ganglia, by ending in peri-cellular baskets, which surround the 

 cell bodies of the sympathetic neurons. These fibers will now 

 be more fully considered. 



Ehrlich (4) in his first communication on the reaction of 

 methylen-blue on living nerve tissues, described a plexus of 

 fine fibrillae about the cell bodies of the sympathetic nerve cells 



