E. Lindon Mellus 363 
in the dog, that is, about 5 to 6 mm. above the calamus scriptorius. 
The cells are considerably smaller, being of about the same size as 
those cells scattered among the descending root bundles of the acusti- 
cus; they are arranged in a more compact nest, and apparently have 
fewer processes than those in the dog. While in man the number of 
cells in each section is much greater, the extent of the nucleus from 
below upward is much less, being in man only about 5 mm. in one 
ease, and 1.5 mm. in another in which its upward extension was not 
so continuous. 
Fig. 3. Fasciculus solitarius and nucleus ‘“‘y” in man. (Reproduced from photo- 
graph.) F.S., fase. solitarius; y., group of cells lateral to fasc. solitarius. 
In the absence of more exact data it is probable that this collection 
of cells upon the lateral aspect of the fasciculus solitarius in man is 
the homologue of the large cells found practically in the same location 
in the dog. What are the relations of this nucleus, if any, to the 
vagus or glossopharyngeus can only be determined by further research. 
In man small clumps of nerve cells are found at various levels in the 
gray substance surrounding the fasciculus solitarius, but so far as I 
have observed, they are, with this one exception, of very inconsid- 
