It is this fiery element, diffused unequally, distributed in various proportions through the beings of the human species, that sets man in motion, gives him activity, supplies him with animal heat, and which, if we may be allowed the expression, renders him more or less alive. This igneous matter, so active, so subtle, dissipates itself with great facility, then requires to be reinstated in his system by means of aliments that contain it, which thereby become proper to restore his machine, to lend new warmth to the brain, to furnish it with the elasticity requisite to the performance of those functions which are called intellectual. It is this ardent matter contained in wine, in strong liquor, that gives to the most torpid, to the dullest, to the most sluggish man, a vivacity of which, without it, he would be incapable--which urges even the coward on to battle. When this fiery element is too abundant in man, whilst he is labouring under certain diseases, it plunges him into delirium; when it is in too weak or in too small a quantity, he swoons, he sinks to the earth. This igneous matter diminishes in his old age--it totally dissipates at his death. It would not be unreasonable to suppose, that what physicians call the nervous fluid, which so promptly gives notice to the brain of all that happens to the body, is nothing more than electric matter; that the various proportions of this matter diffused through his system, is the cause of that great diversity to be discovered in the human being, and in the faculties he possesses. If the intellectual faculties of man, or his moral qualities, be examined according to the principles here laid down, the conviction must be complete that they are to be attributed to material causes, which have an influence more or less marked, either transitory or durable, over his peculiar organization. But where does he derive this organization, except it be from the parents from whom he receives the elements of a machine necessarily analogous to their own? From whence does he derive the greater or less quantity of igneous matter, or vivifying heat, that decides upon, that gives the tone to his mental qualities? It is from the mother who bore him in her womb, who has communicated to him a portion of that fire with which she was herself animated, which circulated through her veins with her blood;--it is from the aliments that have nourished him,--it is from the climate he inhabits,--it is from the atmosphere that surrounds: all these causes have an influence over his fluids, over his solids, and decide on his natural dispositions. In examining these dispositions, from whence his faculties depend, it will ever be found, that they are _corporeal_, that they are _material_.