DR. D. PERRIER ON THE BRAIN OE MONKEYS. 
457 
It uses its left hand more than the right in laying hold of any thing. Formerly it 
used the right chiefly. 
It is very easily knocked over by a push when it is sitting, often falling quite supine. 
It was again fed, as it does not seem able to feed itself. 
8 p.m. The eyelids are somewhat oedematous, more so on the right than on the left. 
The animal sits leaning its weight chiefly on the left arm and leg. When knocked 
over, which is done by a slight push, it recovers itself chiefly with the left arm 
and leg. The right leg, when it sits, is sometimes doubled up, and rests on its 
outer side. It makes no use of its right arm for any voluntary movement. The left 
arm and leg are moved cautiously. Muscular resistance continues in all four limbs- 
There is no facial distortion. 
On being tested with a red-hot iron there was entire absence of reaction on the 
right side. The left side seems to react somewhat less than before. 
The animal, in struggling when acetic acid was placed in its nostrils, moved all four 
limbs, but it fell repeatedly while trying to get rid of the irritation. 
At 9 p.m. the animal was killed with chloroform. 
Post mortem Examination . — The skull was deficient below the parietal eminences, 
and the brain-substance was protruding slightly from the orifices in the skull. The 
dura mater stripped readily from the brain, but underneath it there was found a thin 
layer of extravasation over the region of the right temporo-sphenoidal lobe. 
In the left hemisphere (see fig. 17) there was a surface corresponding to the trephine- 
Pig. 16. 
Pig. 17. 
Pig. 16 represents the right hemisphere, and the 
shaded part the extent of superficial injury in Ex- 
periment XIII. The dark shading in the centre 
indicates the point of greatest depth of the lesion. 
The dotted lines indicate the extent of internal 
softening of the medullary matter. 
Pig. 17 represents the left hemisphere, and the 
shading the extent of superficial lesion in Experi- 
ment XIII. The deep shading in the centre indi- 
cates the line of deep transverse section, and the 
dotted lines indicate the extent of internal softening 
of the interior of the lobe. 
opening of about the size of a shilling, somewhat elevated above the surrounding surface. 
The middle of this was deeply excavated, and the division extended from behind the 
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