36 HUBER. [Vol. XVI. 



becomes surrounded with a sheath of myelin, I have been unable 

 to determine. 



The dendrites vary in number ; four to six are usually seen. 

 They are quite short, and in my preparations do not undergo 

 much branching ; this of course may be due to imperfect stain- 

 ing. The dendrites terminate between the ganglion cells, are 

 extra-capsular, and form a loose network, the arrangement of 

 which depends in part on the number and relative position of 

 the adjacent neurons. 



Mediillated Fibers of the Ganglion. — In sections a large num- 

 ber of medullated fibers are seen in the sympathetic ganglia of 

 fishes. Many of these pass through the ganglia without giving 

 off any branches. This is especially the case in the smaller 

 ganglia, which are recognized as spindle-shaped enlargements in 

 the course of a nerve trunk. Other medullated fibers, which 

 give off one or several branches in the respective ganglion, are 

 frequently met with. These branches, which are usually smaller 

 than the parent fiber, end in a network on the cell bodies of the 

 sympathetic cells. This network varies much in complexity ; 

 and in double-stained preparations it may easily be seen that 

 this network is intra-capsiilar. It may be quite simple, as may 

 be seen in PI. Ill, Figs. 2 and 3, where only the network is 

 shown. In Fig. 2, a, the portion of the neuraxis shown (a 

 collateral branch of a medullated fiber), divides into four smaller 

 branches, which anastomose to form a pericellular plexus ; in 

 PI. Ill, Fig. 3, both the neuraxis and the terminal fibrillae are 

 very small and beset with varicose enlargements. This pericel- 

 lular plexus enclosed a long oval cell, lying between the nerve 

 fibers of a ganglion ; the cell was only faintly perceptible and 

 is outlined in black ; the processes were not made out. In 

 Fig. 4 is shown a more complicated ending. The large axis 

 cylinder, a, which was surrounded by a medullary sheath (not 

 shown in the figure), breaks up within the capsule into a num- 

 ber of branches, some of which pass over the cell, others ending 

 between the cell and the capsule in a number of branching, 

 twisted, or coiled fibrillae. In PI. Ill, Fig. 5, the same cell is 

 again represented, after staining in alum carmine (the prepa- 

 ration from which Fig. 4 of PI. Ill was sketched was broken 



