DR. D. FERRIER ON THE BRAIN OE MONKEYS. 
455 
With the exception of this appearance on the surface, the brain otherwise was per- 
fectly normal in appearance. 
The fungus was attached to the superior temporo-sphenoidal convolution along two 
thirds of its extent. 
The lower end of this and also of the middle temporo-sphenoidal convolution were 
not broken down externally, but they were much congested. 
The rest of the lobe was completely broken up. The lesion extended inwards, so as 
to appear on the inner surface of the temporo-sphenoidal lobe, leaving only a continuity 
of a narrow band between the lower and upper end of the uncinate gyrus (see fig. 15). 
The hippocampus was much softened. 
The occipital lobe was intact, as also the optic thalamus. 
The olfactory tract and bulb were uninjured, as also the crura, corpora quadrigemina, 
and corpus striatum. 
This experiment is another link in the chain of evidence pointing to the association 
of hearing and smell with integrity of the temporo-sphenoidal lobe — hearing on the oppo- 
site and smell on the same side. The hypothetical seats of these, the superior temporo- 
sphenoidal for hearing and the subiculum cornu ammonis for smell, were either disinte- 
grated or cut off by the lesion described. Though the effect is not regarded as conclusive 
proof of this association, it will be seen to derive importance from conjunction with 
other experiments to be related. At the same time, however, the fact is again noted 
that tactile sensation was almost completely abolished on the right side. This effect was 
subsequent to the phenomena just observed, and apparently advanced with the process 
of softening inwards towards the hippocampus and uncinate convolution. 
Fig. 14. 
Fig. 15. 
Fig. 14 represents by the shaded part the extent 
of the lesion as seen on the outer aspect of the left 
hemisphere in Experiment XII. The dark shading 
in the centre indicates the part at which the lobe 
was deeply injured. 
Fig. 15 represents the extent of the lesion, as 
seen on the inner aspect of the temporo-sphenoidal 
lobe. 
Experiment XIII. 
February 2nd, 1875. — The brain of a monkey was exposed by trephining over the 
