LESION OF DIFFERENT REGIONS OF THE CEREBRAL HEMISPHERES. 481 
The margin of the fungus cerebri of the left hemisphere, which bulged considerably 
above the level of the rest of the tissue, corresponded very closely with the position of 
the parieto-occipital fissure, the posterior limb of the angular gyrus merging gradually 
into it (see Plate 20, fig. 1). 
The posterior angle of the postero-parietal lobule formed part of the fungus. 
Remarks. —This, the first of the series, was an unsuccessful experiment as regards 
antiseptics, owing to the dressings not having been fixed in such a manner as to 
prevent their being torn off by the animal. Owing to this, though the dressings were 
re-applied, and the wound v/as treated on the most approved surgical principles, 
meningo-encephalitis and death occurred. 
The case however shows that, notwithstanding the almost entire removal of one 
occipital lobe, vision was not appreciably affected ; inasmuch as the animal was able to 
run about and avoid all obstacles on either side, and also to pick up things on either 
side, and with either hand : actions which would not be consistent with the existence 
of hemiopia on one side or the other. 
The weakness of the right leg can be accounted for by the implication of the cortex 
and medullary fibres of the postero-parietal lobule in the inflammatory softening of the 
fungus cerebri. 
Experiment 2* (Plate 20, figs. 2 and 3). 
In this animal—a small Baboon —both occipital lobes were exposed by a trephine 
opening in each occipital region f inch in diameter. With the galvanic cautery a 
deep incision was made in each occipital lobe at right angles to the longitudinal axis, 
the cortex and medullary fibres being broken up and disorganised so far as the 
trephine openings permitted, to the depth of an inch or more so far as could be 
judged. 
Within an hour the animal was able to run about the laboratory, and being near 
some hot pipes, it stretched out its hands, seized the top pipe, and climbed up. 
Within two hours it was quite lively and active, responded when whistled to, and 
took things offered it without hesitation. 
Two hours and a quarter after the operation the animal, which had been sitting 
on a ledge—to which it had climbed—eating a potato, jumped down after finishing it, 
and took possession of another piece which had been laid on the table some time 
previously. 
There was therefore no question as to the animal’s vision. 
Next day the animal was in all respects normal, active and vivacious, curious as to 
all within its reach, and very expert in catching flies buzzing about. It showed signs 
of liking the smell of bergamot, made grimaces over acetic acid, and spat out a piece 
of potato which had been smeared with aloes. Motor powers and tactile sensibility 
were unimpaired. 
This animal continued in perfect health, and was noted for its fun and tricks, and 
domineering over all its companions. 
MDCCCLXXXIV. 3 Q 
