. Anthropology. developmentin number and tortuosity, causes not only an absolute increase inthe quantity of these convolutions, but also a reduction in size ofeach of them taken singly. Large and simple convolutions are thusa sign of idiotcy, or of weak intellect, in any race. Small convolu-tions with numerous foldings are a sign of large intellectual , by carefully studying the brains of monkeys, of thefoetus, of infants, and of idiots with simple convolutions, all thisis explained. Desmoulins first drew attention to this subject.*The imaginative fancies of phrenologists, and
. Anthropology. developmentin number and tortuosity, causes not only an absolute increase inthe quantity of these convolutions, but also a reduction in size ofeach of them taken singly. Large and simple convolutions are thusa sign of idiotcy, or of weak intellect, in any race. Small convolu-tions with numerous foldings are a sign of large intellectual , by carefully studying the brains of monkeys, of thefoetus, of infants, and of idiots with simple convolutions, all thisis explained. Desmoulins first drew attention to this subject.*The imaginative fancies of phrenologists, and some recent resultsin reference to the localisation of the faculties, have given it a * Anatomie du Systfeme Nerveux, by A. Desmoulins, vol. ii., 1825. ; ;ChaP. III.] CONVOLUTIONS. 107 new direction. Eow, thanks to tte labours of Gratiolet, Owen,Turner, Bischoff, Broca, and Ecker, it has been made clear. Allthat we must do is to turn it to account lq studying the science ofcomparative intellectual phenomena.* 3. Fig. 16,—Diagram of the external surface of the brain : A, Fissure of Sylvius ; B, Fissureof Rolando ; C, Parallel sulcus ; D, Interparietal sulcus; E, External perpendicularfissure. 1, First antero-posterior frontal convolution, double ; 2, Second frontal convolution ;3, Third frontal convolution; 4, 5, 6, Convolutions of ^the orbital region of the frontallobe; 7, Ascending frontal, or ascending anterior convolution ; 8, Ascending parietal,or ascending posterior convolution; 9, Superior parietal convolution; 10, Inferiorparietal convolution, or curved fold; 11,12, First and second temporo-sphenoidal con-volutions ; B, Third temporo-sphenoidal convolution in continuation with the thirdtemporo-sphenoidal of the internal surface; 14, The three storeys of the occipitallobe ; ffl and 6, First and second plis de passage, uniting the two parietal convolutionswith the occipital lobe; e and (Z, Third and fourth plis de passage, uniting the lasttwo temporo-sphenoidal convoluti
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