If, by tying its main artery, we stop most of the blood going to a limb, then, for as long as the limb performs its function, those parts which are called into play must be wasted faster than they are repaired: whence eventual disablement. The relation between due receipt of nutritive matters through its arteries, and due discharge of its duties by the limb is a part of the physical order. If, instead of cutting off the supply to a particular limb, we bleed the patient largely, so drafting away the materials needed for repairing not one limb but all limbs, and not limbs only but viscera, there results both a muscular debility and an enfeeblement of the vital functions. Here, again, cause and effect are necessarily related. The mischief that results from great depletion, results apart from any divine command, or political enactment, or moral intuition. Now advance a step. Suppose the man to be prevented from taking in enough of the solid and liquid food containing those substances continually abstracted from his blood in repairing his tissues: suppose he has cancer of the esophagus and cannot swallow--what happens? By this indirect depletion, as by direct depletion, he is inevitably made incapable of performing the actions of one in health. In this case, as in the other cases, the connection between cause and effect is one that cannot be established, or altered, by any authority external to the phenomena themselves. Again, let us say that instead of being stopped after passing his mouth, that which he would swallow is stopped before reaching his mouth; so that day after day the man is required to waste his tissues in getting food, and day after day the food he has got to meet this waste, he is forcibly prevented from eating. As before, the progress toward death by starvation is inevitable--the connection between acts and effects is independent of any alleged theological or political authority. And similarly if, being forced by the whip to labor, no adequate return in food is supplied to him, there are equally certain evils, equally independent of sacred or secular enactment.