158 Journal of Comparative Neurology. 



fibers of these cells and permeating and branching in the calyx 

 in all directions (figs. 23, 26, 27, PI. XXI). Often they are 

 impregnated almost to the exclusion of the fibers from the cells 

 above. At other times both appear, but then they most often 

 obscure one another, making it necessary to section a large 

 number of brains in order to find cases sufficiently free from a 

 repetition of details to enable one to determine the form and 

 relationships of the various fibers correctly. When such cases 

 occur it is found that the fibers terminating in the calyx all 

 ■ make their entrance in the neighborhood of the junction of the 

 calyx and stalk, or from the under surface of the cups. All 

 appear to send a main fiber in a circle about the head of the 

 stalk and from this to radiate numerous branches to the more 

 distant parts. 



The difference in size and mode of branching of these en- 

 tering fibers allows two kinds to be distinguished. In the 

 smaller kind of branches radiated from the region of the stalk, 

 one slender kind branch more or less irregularly and repeatedly, 

 terminating finally in an irregular swelling such as shown in. fig. 

 27, which represents a magnification of about 583 diameters. 



The larger kind (fig. 23) radiate off from the portion en- 

 circling the head of the stalk a number of stocky branches that 

 after penetrating the surrounding mass of fibers for a relatively 

 short distance branch out into a cymose head. Other portions 

 aparently of this same fiber pass out into more distant parts of 

 the calyx. The figure given was drawn with as much care as 

 possible and well represents what was seen, but appearances 

 are often deceptive, and I am inclined to think there are two 

 kinds of fibers here instead of one as represented. It may 

 happen that fibers overlie one another in such a way as to ap- 

 pear as one continuous fiber, a deception that, especially in 

 thick sections, the most careful focusing will not always avoid. 

 The fibers shown in the figure as immediately surrounding the 

 junction of the stalk and calyx appear to be restricted to the 

 region covered by the median group of small cells. The others 

 appear to have gained an entrance to one side of the stalk and 



