114 Journal of Comparative Neurology. 



going to the periphery, the other going to another gangh"on 

 cell. 



In d of Fig. 8 is shown a ganglion cell of the sympathetic 

 of a frog. This was sketched from a section of a sympathetic 

 ganglion, .stained in methylen-blue and counter-stained in alum 

 carmine. As may be seen in the figure, the peri-cellular plexus 

 ( basket ) is intra-capsular, as described by Retzius, and encloses 

 the cell body, as stated by Ehrlich (4), Retzius (72), Arnstein 

 (73), and Smirnow (76); and does not, as for instance Feist ij']^ 

 suggests, form a portion of the cell body. Double stained pre- 

 parations leave no doubt concerning this question. The figure 

 further shows that this basket is formed by branches of the 

 spiral fiber, as first accurately described by Ehrlich (4). We 

 have I believe, very strong evidence, that these spiral fibers do 

 not go to the periphery, but are the terminal branches of med- 

 ullated fibers ending in baskets. In ganglia partially stained 

 in methylen-blue, fixed in picrate of ammonia and cleared in 

 glycerine, medullated nerve fibers can often be traced for long 

 distances, and their mode of ending clearly made out. In Fig. 9 

 is reproduced a sketch of such a fiber drawn under the 1-12 

 oil immersion with the aid of a camera lucida and then reduced 

 to two-fifteenths. At the top of the figure is seen a medullat- 

 ed nerve fiber, a fiber which entered a ganglion through a white 

 ramus. The course and branchings of the fiber are shown in 

 the figure. As may be seen, a number of the non-medullated 

 branches were traced into end baskets. 



The "T" division described by Retzius (72), and the an- 

 astomosis between ganglion cells suggested by Smirnow {j6) 

 may I believe be explained on the supposition of incomplete 

 staining of a medullated fiber the branches of which end in 

 end-baskets. 



I should thus regard the sympathetic neurons of the frog 

 as unipolar cells, the straight process being the neuraxis of 

 such cells, the spiral fibers the ending of another neuron, as 

 Kolliker (34) has previously stated. 



(e.) Fishes. In fishes the peri-cellular baskets are as a 

 rule somewhat simpler than in other vertebrates, simpler in so 



