LESION OF DIFFERENT REGIONS OF THE CEREBRAL HEMISPHERES. 551 
sphenoidal and hippocampal region there was no other injury ; the optic tracts, crus 
cerebri and basal ganglia being absolutely intact. 
Remarks .—In this case there was some reason for believing that the antiseptic 
arrangements were defective, and that in consequence the primary lesions had become 
the centre of secondary inflammatory processes, shown in the unilateral spasms on the 
third day and subsequent secondary haemorrhage. 
The symptoms of anaesthesia also became intensified. Though at first these were of 
a most pronounced character, sensibility to mere contact being abolished, but anal¬ 
gesia not complete, on the third day tactile sensibility in all its forms was completely 
abolished. Though there was no motor paralysis, the manner in which the limbs 
were used indicated also abolition of the so-called muscular sense. 
Hearing was throughout unimpaired, and vision to the right was only slightly 
impaired, due evidently to the lesion inflicted on the cortex and medullary fibres of 
the visual centres. 
Again the attempt was unsuccessful to maintain the animal alive for any lengthened 
period of observation. Another similar attempt was made in the following experi¬ 
ment. 
Experiment 29 (Plate 32. figs. 141-148). 
In this case the left hemisphere was exposed as in the two previous experiments 
over the region of the incisura prse-occipitalis, and the hemisphere incised with the 
cautery horizontally underneath the inferior occipital convolution, and also along the 
posterior border of the middle temporo-sphenoidal convolution ; the portion between 
the two incisions being disorganised as much as possible without injuring the crus, 
so far as could be judged. 
The animal an hour and a half after the operation was able to sit up, using all four 
limbs freely, but always fell over on the right side, the limbs on this side seeming 
suddenly to give way. At this time the slighest scratching or sound made near the 
right ear caused the animal to open its eyes and look round to this side. 
Tactile sensibility, tested with heat, was profoundly impaired, there being scarcely 
any reaction on the right side to a degree of heat which caused the most lively signs 
of feeling on the left—on the face, hand and foot. 
Next day the animal was in excellent health and vigour. Hearing and vision to 
the right side were unimpaired. It turned sharply to the slightest sound near the 
right ear, and picked up food, and took things held to its right side. Tested with 
heated point there was some reaction to severe stimulation on the right, but much 
less than on the left. While the animal was holding by the bars of the cage with 
both hands, a heated wire applied to the right hand caused no movement, but placed 
directly after—and so much cooler—on the left hand caused the animal to withdraw 
this hand sharply and rub it vigorously. 
Similarly as regards pricking the hands with a pin. A spill of paper introduced into 
