A small amount of water can be absorbed by the skin. Oils can also be absorbed. In case of malnutrition in children, olive-oil rubs are often helpful. This absorptive function is taken advantage of by physicians who rub various medicaments into the skin. Mercury enough to produce salivation can be absorbed in this way. From the above it will be seen that the skin is not only complex in structure, but has many functions. It is impossible to have perfect health without a good skin. Under civilized conditions a healthy skin can not be had without giving it some care. The average person has a skin that shows lack of care. Fortunately, but little care is needed. A bath should be taken often enough to ensure cleanliness. Warm water and soap need not be used more than once or twice a week under ordinary conditions. If the soap causes itching, it is well to use a small amount of olive oil on the body afterwards, rubbing it in thoroughly, and going over the body with a soft cloth after the oil rub, thus removing the oil which would otherwise soil the clothes. If the skin is not kept clean, the millions of pores are liable to be partly stopped up, which results in the retention of a part of the excretory matter within the skin, where it may cause enough irritation to produce some form of cutaneous disorder, or the skin may through disuse become so inactive that too much work is thrown upon the other excretory organs, which may also become diseased from overwork and excessive irritation. Soaps are irritants. Tallow soaps and olive oil soaps are less irritating than other varieties. Whatever kind of soap is used, it should be rinsed off thoroughly, for if some of it is left in the pores of the skin roughness or even mild inflammation may ensue. Be especially careful about the soap used for babies, avoiding all highly colored and cheap perfumed soaps. Whether to take a daily sponge bath or not is a matter of no great importance, and each individual can safely suit himself. If there is quick reaction and a feeling of warmth and well-being following a cold sponge, it is all right. If the skin remains blue and refuses to react for a long time, the cold sponge bath is harmful. The cold plunge is always a shock, and no matter how strong a person may be, frequent repetition is not to be recommended. People who take cold plunges say that they do no harm, but it is well to remember that life is not merely a matter of today and tomorrow, but of next year, or perhaps forty, fifty or sixty years from today. A daily shock may cause heart disease in the course of twenty or thirty years. A good way to take a cold bath is to get under a warm shower and gradually turn off the warm water. Then stand under the cold shower long enough to rinse well the entire surface of the body.