Blood. The blood takes its origin from the chyle, which is produced by the digestion of food in the stomach. It may take from three to seven hours to convert elementary substances into blood. As the blood circulates, it deposits nourishing particles in its course, and thus repairs the tissues to which it is supplied It also removes those matters resulting from decomposition consequent upon vital action. Every particle of the body has a life and death independent of the life and death of the general system. And the body of man really lives and dies many times in the course of what is termed a life. Such is the rapidity of the circulation, that if the blood flowed at an equal rate in a straight line, it would run through one hundred and fifty feet in one minute.