"The nostrils also are made for the purpose of collecting, inspiring, and expiring air, that by the renewal of the breath, the natural heat which is in the heart may, by means of the lungs, be either warmed or cooled, as the occasion may require; while the lungs are made to abide in the breast, that by their softness they may soothe and cherish the vigour of the heart, in which the life seems to abide; -- the life, I say, not the soul. And what shall I say of the substance of the blood, which, proceeding as a river from a fountain, and first borne along in one channel, and then spreading through innumerable veins, as through canals, irrigates the whole territory of the human body with vital streams, being supplied by the agency of the liver, which is placed in the right side, for effecting the digestion of food and turning it into blood? But in the left side is placed the spleen, which draws to itself, and in some way cleanses, the impurities of the blood.