204 RALPH EDWARD SHELDON 
and are noticeably so in its caudal part, where they become large, 
spindle shaped or pyramidal, as the nucleus cerebellaris hypo- 
thalami is approached. This nucleus corresponds to the ‘gross- 
. zellige’ portion of the nucleus ventralis thalami of Goldstein. 
By the Weigert or Ramon y Cajal methods the nucleus prero- 
tundus and rotundus show a peculiar blotched appearance, due 
to the presence of small bundles of fine fibers scattered between 
the islands of cells; fig. 102 brings this out fairly well. 
Nucleus posterior thalami. Lateral to the nucleus rotundus, 
at the level of the nucleus posterior tuberis, is a nucleus of very 
large ganglion cells, the nucleus posterior thalami, the ‘ Vereins- 
gebiet’ of Bela Haller (figs. 103, 106, 117). This gradually in- 
creases in size caudally finally disappearing in the nucleus cere- 
bellaris hypothalami. Its cells are particularly large as shown in 
fig. 109 from a toluidin blue preparation and figs. 110 to 113 from 
Golgi preparations. 
Nucleus ruber tegmenti. Dorso-mesal to the caudal part of 
the nucleus posterior thalami, and dorsal to the nucleus subro- 
tundus is a nucleus of extremely large cells, the nucleus ruber 
tegmenti of Goldstein (fig. 117). 
The remaining centers of the thalami are omitted from con- 
sideration in this article as they have no special connection with 
the olfactory apparatus and are not necessary for purposes of orien- 
tation. This includes the nucleus dorsalis of Goldstein, the nucleus 
corticalis of Kappers, the nucleus praetectalis, and nucleus inter- 
medius of Goldstein. 
(3) Hypothalamus. The hypothalamus consists of the lobus 
medius and part of the lobi laterales of the inferior lobes (figs. 
3, 4), together with their included centers and connections, and 
the hypophysis. The lobus medius consists rostrally of the tuber 
cinereum and caudally of the pars infundibularis. Ventro-ros- 
trally, as previously noted, is given off the hypophysis, while 
extending caudally from the pars infundibularis, is found the 
saccus vasculosus. 
Nucleus anterior tuberis. A single group of cells, the nucleus 
anterior tuberis, makes up the larger part of the rostral portion 
of the lobus medius (figs. 81, 84, 89). This is composed of smaj] 
