74 HUBER. [Vol. XVI. 



ance of the pericellular plexuses in the sympathetic ganglia as 

 seen by me. In double-stained sections there can be no doubt 

 that the pericellular plexuses are in contact with the cell body 

 of the sympathetic cell — are intra-capsular. This agrees with 

 the following statement found in Dogiel's (40) account : " Das- 

 selbe" (speaking of the pericellular plexuses) " liegt unmittelbar 

 der Oberflache der Ganglienzellen an und befindet sich, wie 

 mir scheint, zum Unterschiede von dem intercellularen Geflecht 

 nicht iiber, sondern unter der Zellenhiille." The fibers termi- 

 nating in the pericellular plexuses are usually non-medullated 

 for some distance from the cells around which they end {a, PI. 

 V, Fig. 2.3), although in a few instances they are medullated 

 to the point where they pierce the capsule, b, of the same 

 figure. In some few instances much more complicated peri- 

 cellular plexuses were seen, in which the fiber or fibers termi- 

 nating in such plexuses were spirally wound around some 

 process, probably the axis-cylinder branch of the cell enclosed 

 by the pericellular plexus. One such ending is shown in PI. V, 

 Fig. 24, taken from the stellate ganglion of a dog. In the few 

 instances seen by me the network resulting from the division 

 and redivision of such spiral fibers is much more complicated 

 than the pericellular plexuses usually observed. The fibrils are 

 very varicose, often presenting quite large nodular enlargements. 

 Aronson (19) has described spiral fibers in the sympathetic gan- 

 glia of the rabbit. His description leads one to infer that they 

 are quite common. A comparison of the figures given by 

 Aronson (especially Fig. i) with my PI. V, Fig. 24, may suf- 

 fice to show that very dissimilar structures are spoken of in 

 the two accounts. Spiral fibers, such as he describes, formed 

 by one, two, or three varicose fibers, twisted once, twice, or 

 three times around the neuraxis of the sympathetic cell and 

 terminating in an ordinary pericellular plexus, have now and 

 then been seen by me. In this account, however, the term 

 " spiral fiber " is confined to such as are diagrammed in PI. V, 

 Fig. 24, ending in a more complex pericellular plexus. These 

 were only rarely seen by me. They resemble, to some extent, 

 the more complicated pericellular plexuses, with spiral fibers, 

 described for Reptilia. 



