6o6 'Journal of Comparative Neurology atid Psychology. 



process may arise from the small end of a pear-shaped body or as 

 one of the dendrites of a multipolar cell. The small processes are 

 sometimes well developed dendrites and occasionally the cells present 

 a typical multipolar or stellate form. Usually, however, the processes 

 give the impression of small and unimportant dendrites. I am 

 inclined to think with Cajal (1896) that these dendrites are embry- 

 onic and transitory, but would add that they have greater importance 

 and permanence in fishes than in higher forms. Often, even in 



'^-"^^ 



Fig 7. Five cells from the nucleus tecti of the toud. a. bipolar with 

 coarse dendrite and fine axone ; b, c, d, multipolar, having in addition to the 

 large process a true axone and a small dendrite; e, pear-shaped cell whose 

 single process divides into a coarse dendrite and a slender axone. The cells 

 are taken from different sections. X I'^'S- 



fishes, I have been unable to find any processes besides the one large 

 one. The large process, however, in selachians and the toad has 

 occasionally been seen to divide at a short distance from the cell into 

 two branches, one thick and one much finer (Fig. 7). There is a 

 certain similarity between these and the unipolar cell figured by Van 

 Gehuchten. In silver preparations of the brains of the rat, mouse 

 and rabbit I have looked for a branching of the large process near 

 the cell-body, but have not seen it. A more extensive and careful 



