The whole nervous system derives benefit from the stimulation of brief cold baths. This is one of the most valuable functions of water. Hydrotherapy has come to be a most valuable adjunct to the treatment of all nervous diseases. A slow stomach may be wakened up and set to doing effective work by a general cold bath taken daily, or by a local application of cold water. A cold water bag over the stomach for half an hour just before meal time is a wonderful appetite awakener, which may be used by persons whose circumstances preclude them from the general cold bath and the exercises which cause a natural desire for food. The best of all prescriptions for cold feet is to stand in very cold water a half inch deep and rub one foot with the other in alternation for five minutes. Hydrotherapy is the principal curative agent employed in the great Battle Creek Sanitarium, and its branches throughout the world, and in his book “Rational Hydrotherapy,” Dr. Kellogg has presented in a shape that makes the knowledge available to everybody the modes of treatment which may be employed at home. “A good way,” says Dr. Kellogg, upon whom we draw for information in the preparation of this chapter, “is to stand in the bath tub with the cold water faucet open and the plug out.” It will not be long before the feet will be red and will fairly burn with the afflux of fresh, warm blood which will rush to the feet. Hot water can be used in conjunction with cold water, since heat tends to lessen vital work, and so heat may be employed when it is desired to diminish organic activity. Pain is one direct evidence of excessive activity. Heat is nature’s great remedy for internal pain. Heat cuts off the influence of cold and at the same time diverts the blood to the surface of the body. Cold, on the contrary, usually increases pain when the seat of it is some internal organ. Sometimes heat and cold are applied at the same time, as for a toothache, for instance, when a hot fomentation is applied to the cheek and an ice bag to the neck under the jaw. Pain in the pelvis is almost always relieved by a very hot foot bath or leg bath, which relieves the congestion by diverting the blood into the legs, and thus removes the condition which was responsible for the pain. THE CARE OF THE TEETH It appears to be a fact that in the United States the profession of dentistry, both mechanical and medical, has been carried to its highest point. No doubt Americans will cheerfully assure themselves that American brains and “bustle” are responsible for this condition. But the truth can not be quite so comforting; the great development of dentistry in this country must be due to the demand for it; and the demand for it evidences a state of affairs that is far from reassuring.