Thus far we have considered alcohol only as an agent which affects the nutrition of the nerves. Whether it be also a food or not does not essentially alter the question of its evil or beneficent influence upon the system. As we saw in our chapter on Tobacco, the human organism needs, for its proper nutrition, stimulus as well as food,--force as well as material. No conclusion in physiology is better established than that narcotic-stimulants increase the supply of force while they diminish the waste of material;[19] and it is by virtue of this peculiarity that they will often sustain the organism in the absence of food. Tobacco is not food, but if you give a starving man a pipe to smoke it will take him much longer to die. Opium and coca are not foods; but they will sometimes support life when no true aliment can be procured. The action of alcohol is similar to that of these substances, but immeasurably more effective. None of the inferior narcotic-stimulants is at all comparable with alcohol in the degree of its food-replacing power. We read that tobacco and coca will enable a man to go several days without anything to eat; and we interpret this result as due to the waste-retarding action of these substances. But when we find that alcohol will support life for weeks and months, we can no longer be content with such an explanation. When we recollect that Cornaro lived healthily for fifty-eight years upon twelve ounces of light food and fourteen ounces of wine _per diem_,[20] and reflect upon the large proportion of alcoholic drink in this diet, the suspicion is forced upon us that alcohol is not only a true stimulant but also a true food. [19] See Chambers, _Digestion and its Derangements_, p. 249; and in general, Johnston, Von Bibra, and the paper of Dr. Hammond above referred to. [20] Carpenter, _Human Physiology_, p. 387.