434 
DE. D. FEEEIEE ON THE BEAIN OF MONKEYS. 
means of a scalpel, and the cut surface touched with perchloride of iron to still the 
The operation was completed at 4.40 p.m. 
When the chloroform stupor had passed off, which occurred in a few minutes, the 
animal sat up, but nodded off to sleep, opening its eyes faintly when a noise was made, 
5 p.m. Eagerly drank some sweet tea held to its lips, but immediately went to sleep 
when it was withdrawn. Took a piece of bread and butter held before its face and 
began to eat, but after a bite or two went to sleep, holding the bread in its hand. 
When it was awakened by cold air blown in its face, at which it expressed annoyance, 
it woke up and began to eat again greedily. 
5.15 p.m. The scalp was sewn up. The animal retained sensation. After the opera- 
tion the animal took some food and again went to sleep. 
December 3rd . — The animal is alive and well. Eats and drinks spontaneously, but fre- 
quently subsides into a doze while eating. Is constantly tending to sleep when it is not 
kept awake by external stimuli. It pays little or no attention to any thing going on 
around unless stimuli are applied to it directly. Formerly it used to exhibit the utmost 
curiosity in every thing going on around it. A lighted match held before its face caused 
it to exhibit some curiosity. Touched it several times ; each time showing signs of pain 
and rubbing its fingers vigorously. Formerly the sight of fire used to cause it to run 
away. 
December Mh . — The animal remains in much the same state, sitting quietly, feeling the 
wound, which is oozing, and licking its hand. Occa- 
sionally it runs hither and thither in the cage in an aim- 
less manner. Often subsides into a dozing state, but is 
easily roused by sounds, touch, &c. Eats and drinks of 
its own accord in a mechanical way, frequently going to 
sleep the while. 
Retains all its senses and muscular power. 
Gives evidence of sight by shrinking and holding its 
hands to protect its head when threatened with a stick. 
Whatever is placed in its hand is mechanically raised 
to its mouth. 
December 5th . — The condition is in all essential respects 
unaltered. Another monkey was placed in the cage beside 
it. Of this it took little or no notice. Formerly it took 
the greatest interest in examining any companion placed 
beside it. 
The continual sleepiness continues. 
Fig. 1. 
r _, . Upper view of the hemispheres of the 
I he animal died from exhaustion on the 7th without monkey. The shaded part in the frontal 
ving exhibited any further symptoms. lob ? s indicates the extent to which the 
° J J 1 brain was destroyed m Experiment 1. 
Post mortem Examination . — The frontal lobes were a — the supero-frontal sulcus. 
