OF DENISON UNIVERSITY. 
5 S 
occupying the whole ventral cornu and middle gray portion. (Plate 
XIII, Fig. 4, d.) 
Passing cephalad into the medulla, in a cross section taken just 
caudad to the decussation of the motor tracts (Plate XIV, Fig. i,) the 
general arrangement of the gray and white matter is quite similar to 
that of the cord in the cervical region. The columns of Goll are very 
much reduced in size, being compressed, as it were, by the decussa- 
tion of the motor fibres Md, a little further cephalad, form the funic- 
ulus gracilis. :i 
The dorsal caput cornu is much enlarged and the gray matter 
extends laterally almost to the surface. The gray matter is everywhere 
filled with cells of the multipolar type, which are scattered almost uni- 
formly through the substantia gelatinosa and the dorsal cornu especially 
is charged with nutritive corpuscles. This uniform distribution of cells 
through the gray matter seems to accompany the reduction in the num- 
ber included in the various nuclei. The nucleus of the ventral cornu 
(Plate XIV, Fig. i, is still quite manifest, but the second group, 
which lies somewhat lateral to the first, has lost its identity in the gen- 
eral distribution of cells. 
The number of cells present in the median nucleus (Plate XIV, 
Fig. I, d,) seems to be also somewhat reduced. The cells which were 
so conspicuous in the neck of the dorsal cornu, (Plate XIII, Fig. 4, 
a,) are also much scattered, while a remnant of them seems to persist 
though crowded more dorsally, (Plate XIV, Fig. i, c.) We notice also 
the accumulation of a few cells, somewhat external and lateral to the 
nucleus of the ventral cornu which is the beginning of a large ventro- 
lateral nucleus extending cephalad, (Plate-XIV, Fig. i, c, Fig. 5, c.) 
The expansion of the gray matter seems to be due to the insertion 
of a large number of nerve bundles which are distributed through the 
gray matter and run longitudinally in the medulla, beginning the for- 
matio reticularis of the medulla a little further cephalad. In the sec- 
tion under consideration there is also shown the exit of a small bundle 
given off to the eleventh nerve root, (Plate XIV, Fig', i, a.) The fibres 
seem to be derived from the generally distributed cells. 
Passing a little more cephalad in a section taken at about the first 
fourth of the decussation, (Plate XIV, Fig. 5,) we find that the nucleus 
of the ventral cornu has entirely disappeared, while the ventro lateral 
nucleus (Fig. 5, c,) is much enlarged and is composed of cells of the 
multipolar type, measuring from .03 to .05 mm. in diameter (Plate 
