No. I.] SYMPATHETIC GANGLIA OF VERTEBRATES. 53 



varies greatly in shape and in the course it assumes after leav- 

 ing the cell body. It may be quite straight (Fig. II, A, and 

 PI. IV, Fig. 12, A and B), and break up at a variable distance 

 from the cell into secondary branches ; or it may assume a 

 tortuous course (Fig. II, B, C, and E), and may (see figure) 

 be partly wound around the cell or twisted upon itself. This 



Fig. II. — Sympathetic neurons of Reptilia. (See text for description.) 



process may again be quite short (Fig. II, D), and break up at 

 once into a number of large secondary branches. In such 

 cells the neuraxis may arise directly from this large process, 

 a, of cell B, PI. IV, Fig. 12, and a, of cells B, C, and E, of 

 Fig. II, in which case the large process becomes gradually 

 attenuated and stains more deeply ; or it may arise from one 

 of the dendritic branches at some distance from the cell body, 



