446 
DE. D. EEBKIEE ON THE BKAIN OE MONKEYS. 
When taken out again, and the door shut, it ran back, looking at its companions, 
and desirous to gain admittance. 
When held np to the light it flinched and averted its head. 
The transition after the bandage was removed was of a striking character, and indi- 
cated an evident restoration of sight which had been lost. 
Next day (Nov. 19) the animal looked perfectly well, running about, eating and 
drinking as usual. 
An experiment was then made with the view of ascertaining whether the blindness 
of the right eye had continued. The left eye was again bandaged up as before, and 
the animal placed on the floor. It immediately ran up to the cage, and putting its 
hand through the bars into a dish of water began to lap it. 
Sight had therefore returned, notwithstanding the destruction of the angular gyrus on 
the left side. 
The animal died on Nov. 24 from suppuration and necrosis of the skull, having also 
become paralyzed on the right hand. 
Post mortem Examination . — The angular gyrus and the ascending parietal convolu- 
tions were softened, and the hemisphere fungating from the orifice in the skull. The 
abnormal appearances were confined to the surface of the hemisphere. No drawing 
was made of the exact extent of the softening ; but the paralysis of the right hand coin- 
cided with the destruction of the ascending parietal convolution. This experiment served 
to show that destruction of the angular gyrus resulted in blindness of the opposite eye, 
and that this loss of visual perception was only of temporary duration, compensation 
having been effected within a period of twenty-four hours. 
Experiment VIII. 
January bth, 1875. — The subject of this experiment was the same monkey spoken of 
under the head of Exp. V. 
Two hours after the destruction of the motor centres alluded to, the animal was 
again chloroformed, and the angular gyrus clearly exposed, the left eye closed with 
plaster, and the animal allowed to recover. 
On returning to consciousness it followed my movements with its right eye, and indi- 
cated its sense of hearing by turning its head and looking when called to. Took some 
fruit offered to it in its left hand, and sat contentedly eating it. It seemed disinclined 
to move on account of the motor paralysis of its right side. 
It sat with the right leg doubled up under it, and resting the internal malleolus on 
the floor. Sometimes it supported the right hand with the left. Expressed annoyance 
when pinched. The animal having thus recovered from the operation of exposure of 
the brain, it was taken and the angular gyrus carefully destroyed by means of the 
cautery, no more than two hours having elapsed since the first operation. 
When let loose, it moved about a little when nudged, but would not move of its 
own accord. When forced to move, it avoided obstacles as if it still saw. On exami- 
