The best method of getting rid of these harmful substances is by bathing every day. But water alone, except it be very hot, and the bath of long duration (and in this case it presents some inconvenience and may be injurious also to health if taken daily), is not able to remove the oily and fatty products of the skin. Therefore it is best to use soap in addition to water, and to rub energetically with it the entire skin surface of the body. Besides removing, by a bath, the injurious products that clog the pores, we must take particular care to allow air to penetrate to the pores as freely as possible, thus permitting a free issue to the body exhalations and facilitating respiration by the skin. We should not, therefore, exclude the air by thick, non-porous clothing, such as furs; nor should we use underwear that fits too closely to the body. To permit of a thorough aëration of the skin it would be advantageous to remain exposed naked to the air once or twice during each twenty-four hours, and each time for at least five to ten minutes. When the weather is warm and we bathe in the sea or a river, we combine the advantages of a water and air bath. But in places where there is no sea, lake, or river in which to bathe, we could, if living in the country, enclose some spot for such an air bath which, in sunny weather, would also become a sun bath at the same time. On the grass of a clearing in a wood, or in a garden, such an air bath could best be taken. In summer, if the air is not too warm, and if we are in the sun, we may remain longer than ten minutes in such an air bath. If we are not able to procure a place in which such a bath can be taken quite naked without being seen, the next best thing is to clothe oneself in amply large white pajamas, or, for women, in a very wide white mantle or costume of the empire style, and thus attired to take a walk in the garden or ground of one’s property.