58 HUBER. [Vol. XVI. 



not sketched. In PI. IV, Fig. i8, I have reproduced a sym- 

 pathetic cell with pericellular plexus, taken from one of my 

 most successful preparations, where the structures other than 

 the spiral fiber and pericellular plexus may be seen. This 

 sketch is made from a section of an inferior cervical ganglion 

 of Chelydra serpentina, stained in methylene blue and double- 

 stained in alum carmine. In this sketch the cell body of the 

 sympathetic cell came out more deeply colored than in the 

 section ; in all other respects the coloring and arrangement 

 of nerve fibers and nuclei were followed as accurately as pos- 

 sible. In this figure may be seen B, the cell body, C and Z>, 

 the nucleus and nucleolus, and A, the process of a large uni- 

 polar sympathetic cell. The capsule, c, was clearly made out 

 and could be followed for some distance along the process, 

 when it became unobservable. Three medullated fibers, a, a\ 

 and «", take part in the formation of the spiral and pericellular 

 plexus. Their interlacement is, however, such that they could 

 be followed for only a short distance. At their distal end these 

 spiral fibers break up into secondary branches, which become 

 very varicose and, after further branching, form a basket-like 

 network which surrounds the cell body of the sympathetic cell, 

 the arrangement of which is better shown in the figure than I 

 can describe it. The figure shows most clearly that this net- 

 work is intra-capsular. The figure may further serve to give an 

 idea of the number and the arrangement of the intra-capsular 

 nuclei. These, as has been previously observed, are regarded 

 as nuclei of neuroglia cells. Fig. 19 has been added to give 

 the general appearance of a methylene blue preparation of 

 a sympathetic ganglion of a tortoise, double-stained in alum 

 carmine. In this section the processes of the cells were only 

 partly stained, and the fact that this sketch is from a section will 

 explain the abrupt ending of some of the branches. The figure 

 shows three of the more complex pericellular plexuses. A, with 

 spiral fibers, and one simpler pericellular plexus, B \ shows 

 also the arrangement of the medullated and the non-medullated 

 (varicose fibers in the figure) fibers and of the dendrites as seen 

 in sections. 



My reasons for assuming that the intra-capsular, pericellular 



