OF DENISON UNIVERSITY. 63 
plane of its middle portion. The cells are fine examples of the mul- 
tipolar type. 
This nucleus does not extend dorsad to the level of the sixth nu- 
cleus, which is a relatively broad zone with little dorso- ventral extent. 
The cells of the sixth nucleus lie with their axis from the median 
toward the lateral line and their fibres evidently decussate. 
The same horizontal section (VII 6-19) displaying the nucleus of 
the sixth shows the knee of the seventh, lying between it and the 
median line and enveloping it anteriorly and posteriorly, as already 
described. 
Scattered cells, apparently of the trigeminal system, lie dorsad 
to the structures just described. 
Ventrally, the ventral nucleus of the fifth divides into two ill de- 
fined clusters, the medio-caudad portion being approximated to the 
root tract of the seventh, which latter subdivides into a larger cepha- 
lad and smaller caudad portion. 
Nucleus of the pons. The whole ventral part of the pons is filled 
with cells, which here and there collect into considerable and distinct 
nuclei. The cells are relatively short and paraxial with numerous pro- 
cesses, the largest of which pass transversely, i. e. in the direction of 
the pons fibres. These cells are comparatively small, but their nuclei 
preserve a good size, thus: cells .030-. 035 in. diameter, nuclei .008 
mm. The fibres can be traced from cells of the caudad portion of 
the nucleus laterad and caudad for considerable distances to the root 
of the fifth.' (Plate XIX, Fig 3.) 
The sections at the level of the motor nucleus of the seventh 
show that a part of the anterior portion of the pons nucleus is cut off 
by the passage of the latero-ventral strands of the pyramids and lie 
between those bundles and the pre-peduncular tract from the cerebellum. 1 
Fibres from the cluster in question pass to unite with a nucleus of sim- 
ilar cells at the immediate roots of the fifth. 
The seventh nucleus, as seen in horizontal sections at the level of 
the emergence of its root is divided into three portions lying parallel 
to the median line. The cells are beautiful illustrations of the multipo- 
lar variety (Plate XIX, Fig. 5,) and afford ample suggestion, if not 
proof that the fibrillar terminations of the processes described by 
authors are due to the disposition of connective tissue web in which 
they hang. 
The Cerebellum. Before adverting to the few observations we 
