DR. D. FERRIER ON THE BRAIN OF MONKEYS. 
487 
Experiment III. 
March 16£A, 1875. — The frontal lobes of both hemispheres were exposed in a small 
active and intelligent monkey, and by means of white-hot wires the frontal lobes were 
severed from the rest of the hemispheres by a line passing approximately through the 
anterior extremity of the supero-frontal sulcus on each side. The division, however, was 
slightly further back on the left than on the right side. The operation was completed 
at 1 p.m. 
A few minutes after being let loose it sat up, and seeing a piece of cotton-wool lying 
before it, took it up and began tearing it with its teeth. Offered a piece of apple, it 
seized it and ate it. 
I. 15 p.m. Walks about the room pretty steadily. There is no affection of its mus- 
cular power nor of sensation ; it sees where it goes, turns its head when called to, and 
smells and eats fruit offered to it. 
6 p.m. Animal is found sitting quietly in its cage. It used to be very discontented at 
being shut up, and kept up a continual whining. Offered some fruit, it smelt it and 
ate it. When let out of the cage it ran about the room, giving full evidence of the 
retention of all its special senses and powers of motion. 
7 p.m. Sits in the cage diligently occupied in examining and picking its hands and 
feet and woollen jacket. 
Has rather a stolid look, and makes no attempt to move away when a hand is put 
out to lay hold of it. 
Formerly it was very timid and disliked being touched. 
8 p.m. Eagerly drank some sweet tea. 
When let out of its cage it walked about a little, and then sat down and went on with 
its usual employment of examining and picking at its hands, feet, and coat. 
9.30 p.m. Found sitting in same position at the same employment. Takes no notice 
of whether the room is suddenly lightened or darkened, but goes on with its occupation 
all the same. 
II. 80 p.m. Found asleep on its perch. On the gas being turned up and the animal 
awakened, it began to examine its hands &c. as before. The cat happening to come 
into the room caused it to give a shriek and appear terrified. 
March 11th. — 8.30 a.m. Ate some breakfast; came out of its cage when the door 
was opened, and marched about the room. An hour or two afterwards another monkey 
was placed in the cage beside it. Its companion examined it with curiosity, but it sat 
quietly and made no sign of interest. Gradually sidled up to it, however, and sat 
hugging it, enjoying the warmth of contact. 
2 p.m. When let out of its cage it ran about a little followed by its companion. 
After a few minutes sat down in a corner and began to examine and pick its hands, 
feet, and tail. Makes no resistance when its companion pulls it about rather roughly 
and examines its head. 
