![]() Their convolutions are more numerous, deeper and more sinuous but in some Negroes brains they are more symmetrically distributed than in those of Europeans. It is seen in the greater relative height, breadth, and length of the hemisphere, especially in their backward growth, whereby they wholly cover and pass beyond the cerebellum. The superaddition of convolutional matter to the cerebral hemisphere, during a prolonged period of growth in brains, in man, gives rise to the main distinctions between the human and highest quadrumanal brains. In regard to the principal parts of the brain, the difference of size of the medulla oblongata is rather in favour of the Gorilla: the cerebellum of the Gorilla is smaller, the cerebrum is much smaller than in the Negro. troy that of a full-grown male Gorilla may be estimated at from 10 oz. ![]() The weight of a Negros brain has been found to be from 3 1b. troy the highest capacity in an European skull being 57 oz. Tiedemann records an Ethiopian skull with a capacity of 54 oz. whilst in the male Negroes skulls the range of capacity was from 38 oz. The range of capacity in the male Gorilla was thus found to be from 17 oz. A ready way to obtain the capacity of the cranial cavity is to fill that cavity with millet-seed, to weigh the skull, and then deduct the weight of the empty skull from the filled one. The brain of the Gorilla attaining speedily, in accordance with the law of its growth, the size conformable to its relations with the organs of sense and sensorial nerves terminating in it, seems then to be stricken, as it were, by abrogation of the power of further growth the capacity of the cranium in a young animal with the deciduous teeth, continues to be that, or very nearly that, of the adult, when the skull has received an addition of about six times the amount of osseous matter so disposed to give the requisite force to the jaws and completing the brutish aspect of the full-grown beast. The cerebral distinctions were equally striking and well marked. The osteological distinctions were those which he had pointed out in detail in his Lecture at the Royal Institution on Friday evening, February 4th, 1859 and which received confirmatory illustrations in the rich series of specimens of skulls and skeletons of both sexes and of different ages of the Gorilla, brought over by M. du Chaillus's Lecture on the preceding evening. Owen, in his Lecture at the Royal Institution, on Tuesday (19th of March), entered upon an exposition of the distinctive characters between the Negro (or lowest variety of Human Race) and the Gorilla, as exemplified by the skeleton and brain, the diagrammatic illustrations of which (reduced in cuts 1-4) had been exhibited at Mr. ![]() The Gorilla and the Negro (1861) The Gorilla and the Negro The Athenaeum March 1861
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