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Antecedently to the time of Gall, both Sœmmerring and Cuvier, in the comparative anatomy of the various classes of animals, had investigated the ratio existing between the development of the encephalon and that of the intellectual power. The following remarkable phrase is from the pen of Cuvier: “The proportion of the brain to the medulla oblongata, a proportion which is greater in man than in all other animals, is a very good index of the perfection of the creature’s intelligence, because it is the best index of the preeminence of the organs of reflection above the organs of the external senses.”[6] And this other still more remarkable phrase: “In animals the intelligence appears to be greater in proportion as the volume of the hemispheres is greater.”[7]

Gall, in an especial manner, contends against the assertion of Bichat, who remarks that “The influence of the passions is exerted invariably upon the organic life, and not upon the animal life; all the signs that characterise them are referable to the former and not to the latter. Gestures, which are the mute exponents of the sentiments and the understanding, afford a remarkable proof of this truth. When we wish to signify something relative to the memory, the imagination, to our perception, to the judgment, &c. the hand moves involuntarily towards the head: if we wish to express love, joy, grief, hatred, it is directed towards the region of the heart, the stomach, or the bowels.”[8]