LESION OF DIFFERENT REGIONS OF THE CEREBRAL HEMISPHERES. 509 
there was slight oozing of purulent fluid from the orifice of the wound in the right 
hemisphere. 
The brain was not photographed, but a drawing was made by Mr. F. Le Maistre 
of the right hemisphere, the lesion on the left being similar, though not quite 
symmetrical. The figures have not been reproduced. In the right hemisphere there 
was an area of destruction, caused by the cautery, which had entered instead of 
grazing along the cortex of the middle temporo-sphenoidal convolution. The entrance 
wound was of the size of a threepenny bit, and was situated in the annectent gyrus 
between the posterior limb of the angular gyrus and the occipital lobe. This opening 
was continuous with a sinus, from which the purulent fluid oozed, the direction of 
which was downwards and forwards beneath the cortex, indicated by the point of 
emergence, a small orifice a few millimetres in diameter, situated exactly at the 
lower extremity of the second temporo-sphenoidal sulcus. 
The track of the sinus would be accurately represented by the middle and adjacent 
margin of the third temporo-sphenoidal convolutions. 
Frontal sections of the right hemisphere showed the existence of a cavity, which 
was evidently an enlargement of the original track of the cautery due to the formation 
of pus. This destroyed the greater portion of the medullary fibres proceeding to the 
middle and inferior temporo-sphenoidal convolutions. The superior temporo-sphe¬ 
noidal convolution was intact throughout both in its cortex and medullary fibres. 
In the left hemisphere an area of destruction, corresponding with the entrance of 
the cautery, occupied precisely the same position as in the right hemisphere. 
This led into a sinus, the track of the cautery, which pursued a course beneath the 
cortex, downwards and somewhat further backwards than in the right hemisphere, 
emerging at the lower extremity of the third temporo-sphenoidal convolution, just 
external to the uncus, or end of the gyrus hippocampi. 
Frontal sections of this hemisphere showed destruction of the medullary fibres 
proceeding to the middle and inferior temporo-sphenoidal convolutions; while as in 
the right hemisphere, the cortex and medullary fibres of the superior convolution were 
intact. 
The brain elsewhere was in all respects normal. 
Remarks .—The lesions in this case, especially in the right hemisphere, were evi¬ 
dently larger than those primarily made by the cautery, owing to the occurrence of 
secondary softening. But as no observations were made of the animal for a week 
before its death, the effects, if any, of the further extension of the primary lesion 
were not determined. 
But the track of the cautery was such as to cause extensive destruction of the 
medullary fibres of the middle and inferior temporo-sphenoidal convolutions, and yet 
no defect could be discovered either as regards hearing, vision, tactile sensibility or 
motor power. 
