460 
DR. D. FERRIER ON THE BRAIN OF MONKEYS. 
applied to the left hand caused a sudden start, opening of the eyes, and withdrawal of 
the hand. 
The left side of the lip and face retained sensibility. 
8 p.m. A faint reaction ensued on the application of the hot iron to the right foot. 
The same stimulus applied to the hand caused no reaction. The tongue remained 
absolutely insensible. The left side of the body gives active reaction. 
9 p.m. I repeated these tests in presence of Dr. Lauder Brunton. The absolute 
want of reaction on the right side with the exception of slight reaction of the right foot, 
the retention of sensibility as indicated by reaction on the left side, the absolute insen- 
sibility of the tongue to stimuli of any kind, the entire want of reaction to acetic acid 
placed in the right nostril, and the copious lacrymation of the left eye when it was 
introduced into the left nostril were confirmed in his presence. 
Desirous to avoid further complication after this demonstration, I killed the animal 
with chloroform. 
Post mortem Examination . — The brain, except at the points to be described, was 
everywhere normal. The base of the brain and the cranial nerves were intact. The 
fifth and the Gasserian ganglion on both sides were specially examined and found intact. 
In the left hemisphere there was a wound with blackened edges, of the extent seen 
in fig. 18, occupying the upper part of the superior and middle temporo-sphenoidal 
Fig. 18. Fig. 19. 
Fig. 18 represents the left hemisphere, and the 
shading the extent of the lesion in Experiment XIY. 
The deep shading in the centre indicates the point 
of deepest excavation, and the dotted lines proceed- 
ing downwards and forwards are intended to repre- 
sent the extent of internal disintegration of the lohe. 
convolutions. The middle of this was excavated, and the lesion was continued into the 
interior of the lobe, the whole of which was converted into a softened mass, enclosed 
by a shell of grey matter on the outer and inner aspect of the lobe. The hippocampus 
was injured at a point opposite the wound, and was softened throughout below this. 
There was some blackened effusion within the lips of the fissure of Sylvius and 
covering the surface of the island of Beil, which, however, was of normal consistence, 
Fig. 19 represents the extent of lesion in the right 
hemisphere in Experiment XIY. The shading indi- 
cates the extent to which the grey matter was de- 
stroyed. 
