The brain as an organ of mind . aminedby Theile, weighed only lOO oz. (300 grammes). With the exception of one, it is thesmallest Male Idiots Brain whose character.; have been recorded. This figure is placed here for comparison with that of the brain of the Chimpanzee ;the letters of reference being the same in each of them. Lobes approach rather close to one another (fig. 118), andbetween them are two * Corpora albicantia, as in Man. The Sylvian Fissure in the Cbiinpanzee as well as inthe Gorilla (fig. 117), and the Orang (tig. li^l), is muchless horizontal than it is in Man. In this respect
The brain as an organ of mind . aminedby Theile, weighed only lOO oz. (300 grammes). With the exception of one, it is thesmallest Male Idiots Brain whose character.; have been recorded. This figure is placed here for comparison with that of the brain of the Chimpanzee ;the letters of reference being the same in each of them. Lobes approach rather close to one another (fig. 118), andbetween them are two * Corpora albicantia, as in Man. The Sylvian Fissure in the Cbiinpanzee as well as inthe Gorilla (fig. 117), and the Orang (tig. li^l), is muchless horizontal than it is in Man. In this respect it pretty 298 THE BRAIN OF QUADRUMANA. closely resembles the disposition met with in the brain ofthe Mangabey, the Wancleroo, and other of the * Dog-like Apes (figs. Ill, 113). Its direction more nearlyapproaches the horizontal in the Gorilla than in the othertwo. The Fissure of Rolando is very distinct in the Chim-panzee, though its upper extremity is situated in front ofthe middle of the brain, instead of being more decidedly. j:s w Fig. 117.—Brain of tlic Gorilla, side view. (Afror Bola-i and Pansch.) I, Frontallobe; II, Fissure of Rolando; 111, Parietal lobe ; IV, Temporal lobe. 0. Cerebellum ;fs, Ussure of Sylvius; s c, External Periiendicular Fissuie separating Parietal fromOccipital Lobe. behind it as in Man. According to Marshall, a little morethan one-third of the surface of the Cerebrum lies infront of the Fissures of Sylvius in the Cbimpanzee, insteadof nearly one-half as in Man. In the Orang the propor-tionate size of the Frontal Lobes is strictly the Orang, too, the Fissure of Eolando (fig. 121) isvery strongly bout upon itself—almost at right angles—sothat its lower extremity, instead of being in advance of the Chap. XVII.] THE BRAIN OF QUADRUMAxXA. 299 anterior extremity of the Temporal Lobe, as it is in theGorilla (fig. 117), is more nearl}^ opj^osite the middle ofthe Sylvian Fissure. This peculiar disposition of thefissure of Rolando in th
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