476 
DR. D. EERRIER ON THE BRAIN OE MONKEYS. 
white-hot wires passed perpendicularly downwards close to the sulcus, separating this 
lobe from the angular gyrus. 
4.35 p.m. The animal was let loose and laid down. After a few minutes it attempted 
to sit up, and uttered a croaking sort of sound. 
5 p.m. Moves about the room rather unsteadily, occasionally uttering a short cry. 
Turns its head when called. 
7 p.m. The animal appears to be blind. When placed on the back of a chair it would 
not move, though the chair was shaken, and the animal evidently felt uncomfortable. 
A piece of apple was held before it. It smelt it, and wished to lay hold of it, but made 
futile grasps after it. It could not find the way into the cage when placed close to the 
door. 
8 p.m. It had been intended also to remove the right occipital lobe ; but owing to the 
uncertainty as to the cause of the blindness, it was thought advisable to leave the right 
side undisturbed, so that if the blindness were due to affection of the left angular gyrus 
during the process of removing the left occipital lobe, time should be allowed for com- 
pensation. The wound was therefore sewed up and dressed. 
The animal, when placed on the floor, wished to return to me, but could not find 
its way. 
January Ylth , 10 a.m. — The animal refuses to eat. Drank some water in which its 
mouth was forcibly immersed. When taken out of its cage it is seen to retain its mus- 
cular power, but gropes about on the floor. The pupils are equal and of medium size, 
and react sluggishly to light. 
1 p.m. Tries to climb up whatever it comes in contact with. Likes to be taken up 
and caressed, but cannot find its way. Still continues blind. 
An ophthalmoscopic examination was attempted, but could not be carried out, on 
account of the animal’s restlessness. 
January 18 th . — 10 a.m. The animal looks somewhat more lively today. Ate a fig 
and drank some wafer, but refused other food. Still continues blind, and moves about 
in a groping manner. 
At 10.30 a.m. the animal was killed with chloroform, in order to ascertain the cause 
of the blindness. 
Post mortem Examination . — The wound was suppurating freely. 
The cut surface of the left occipital lobe was found projecting almost to the orifice in 
the skull. 
The exposed surface of the right occipital lobe was soft and pulpy. There was slight 
extravasation on the surface of the dura mater on the right parietal region, caused by 
the rupture of the sinus above alluded to. 
The left occipital lobe had been cut off by a line passing perpendicularly through its 
junction with the left angular gyrus (see fig. 26). 
The angular gyrus was softened all along its posterior division, and just beyond the 
curve (see fig. 28). 
