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54 body must die at the same time with the natural one." [Lectures and Essays, vol. i. p. 247-49. Compare also passages of similar purport in vol. ii. pp. 65-70.]

The theory of production, or materialistic theory, seldom ventures to formulate itself very distinctly. Perhaps the following passage from Cabanis is as explicit as anything one can find:—

"To acquire a just idea of the operations from which thought results, we must consider the brain as a particular organ specially destined to produce it; just as the stomach and intestines are destined to operate digestion, the liver to filter bile, the parotid and maxillary glands to prepare the salivary juices. The impressions, arriving in the brain, force it to enter into activity; just as the alimentary materials, falling into the stomach, excite it to a more abundant secretion of gastric juice, and to the movements which result in their own solution. The function proper to the first organ is that of receiving [percevoir] each particular impression, of attaching signs to it, of combining the different impressions, of comparing them with each other, of drawing from them judgments and resolves; just as the function of the other organ is to act upon the nutritive substances whose presence excites it,