“The interest attaching to the discussion was greatly enhanced by the fact that Professor Ferrier was willing to exhibit two monkeys which he had operated upon some months previously.… In striking contrast to the dog were two monkeys exhibited by Professor Ferrier. One of them had been operated upon in the middle of January, the left motor area having been destroyed. There had resulted from the operation right-sided hemiplegia” (paralysis of the right half of the body) “with conjugate deviation of the eyes and head” (eyes and head permanently twisted). “Facial paralysis was at first well marked, but ceased after a fortnight. From the first there had been paralysis of the right leg, though the animal was able to lift it up. The arm it never had been able to use. Lately, rigidity of the muscles of the paralyzed limb had been coming on. The other monkey, as a consequence of paralysis of all auditory centres, was apparently entirely unaffected by loud noises, as by the firing of percussion caps in close proximity to the head.”—Lancet’s Report of the Proceedings at the International Medical Congress, Oct. 8, 1881.
“Exper. IV., June 18th, 1873.—The right hemisphere of a monkey had been partially exposed and experimented on for the purpose of localising the region of electric stimulation. The part exposed included the ascending parietal and postero-parietal convolutions, the ascending frontal, and the posterior extremities of the three frontal convolutions. After having been under experimentation for eight hours, the animal recovered sufficiently to sit up and take food. The wound was sewn up, and the animal placed in its cage.
“June 19th.—The animal is apparently as well as ever, eating and drinking heartily, and as lively and intelligent as before. No change was perceptible during the whole of this day.
“June 20th.—The wound was oozing, and the animal was less active; but there was no diminution of sensation or voluntary motion. It closely watched flies buzzing about, and frequently made attempts to catch them. Towards the afternoon it began to suffer from choreic spasms of the left angle of the mouth and of the left hand. There was no loss of consciousness. The animal was apparently annoyed by the spasmodic actions of its mouth, and frequently endeavoured to still them by holding its mouth with the other hand. Towards the close of the day the spasms frequently repeated, became more intense, and exhibited an epileptic nature, the convulsions on the left side of the body becoming general. This state continued till.…
“June 23rd.—…
“June 24th.—Hemiplegia is complete on the left side, hand, foot, and face. The animal moved by means of its left limbs, dragging the right after it.
“The animal died from exhaustion on the 27th.”—Croonian Lecture, “Experiments on the Brain of Monkeys,” Philos. Trans., 1875, pp. 441-42.
“Exper. XVI., Feb. 5th, 1875.—This, though not successful as regards the object intended, yet presents some interesting phenomena. The left occipital lobe was exposed posteriorly, and penetrated at the posterior extremity of the superior occipital fissure by means of hot wires, which were directed with a view to follow the inner aspect of the temporo-sphenoidal lobe. There was no hæmorrhage from the sinus. During the operation, the animal was observed to make sighing respiration. The operation was finished at 4.30 p.m. The animal lay in a state of stupor for more than an hour, only making slight movements when disturbed, and then with its left limbs.
“7 p.m.—The animal lies quiet, but indicates consciousness by grunting discontentedly when moved. Struggles with its limbs, chiefly the left, but occasionally with the right. On testing the cutaneous sensibility with the hot iron, reaction was decisive over the whole of the left side, but quite abolished in the right. The animal occasionally opened its right eye, but the left remained permanently closed. The animal passed into a state of coma, and was found dead at 11.30 p.m. The following experiment is a repetition of the last, and was only partially successful.”—Ibid., p. 464.