88 
ON THE INTERNAL CAPSULE OP THE BONNET MONKEY. 
Note change of direction at this point opposite middle zone (m) of lenticular 
nucleus, the fibres forming the internal capsule behind and below [m) are 
respectively occipital, occipito-temporal, and temporal. 
M.C. =■ Middle commissure. 
III., V., and VI. denote the third, fifth, and sixth cranial nerves. 
PLATE 10. 
Groups I.-VI. These are photographs typical of each level at which we have excited 
the capsule, corresponding to the first six groups of our observations. 
Ca. = Caudate nucleus. 
Le. — Lenticular nucleus. 
O.Th. = Optic thalamus. 
PLATE 11. 
Groups VII. and VIII. These are photographs of our last two levels and follow on 
Plate X. 
Note. —Group VIII. has been reversed in the reproduction. 
The section is taken from the left hemisphere, except in Groups IV. and 
VIII., which are taken from the right side. 
Fig. 2. A photograph of a transverse vertical section of the right hemisphere of 
Macacus sinicus, showing the limits of the capsule and the direction of its 
anterior limb in frontal section. 
Ca. — Caudate nucleus. 
C.c. = Corpus callosum. 
Le. ■= Lenticular nucleus. 
S.l. =■ Septum lucidum. 
Fig. 3. This figure is a photograph of a sagittal section of the hemisphere of a 
Macacus sinicus stained by Pal’s method and mounted in balsam. The 
medullated fibres are consequently stained black, the grey matter being of a 
lighter greyish tint. 
A.a. = Anterior or ascending fibres of prasfrontal division of capsule. 
H. — Horizontal fibres of the same. 
S.d. = Superior or descending fibres of the same. 
P.f. — Pyramidal fibres (excitable). 
P. ■=. Fibres entering the posterior limb of the capsule. 
Ca. = Caudate nucleus. 
Le. = Lenticular nucleus. 
O.th. = Optic thalamus. 
A.c. ~ Anterior commissure. 
