683. _Changes of dress, from thick to thin, should always be made in the morning._ At this time the vital powers are usually in full play. Many a young lady has laid the foundation of a fatal disease, by disregarding this rule, in exchanging the thick dress, with woollen stockings, for the flimsy dress and hose of silk or cotton, which are considered suitable for the ball-room or party. Sudden changes in wearing-apparel, as well as in food and general habits, are attended with hazard; and this is proportionate to the weakness or exhaustion of the system when the change is made. -=-=-=-=-=-=-=-=-=-=-=-= 681. Should the garments worn during the day be worn at night? 682. What is said respecting the cleanliness of beds and bedding? Why should not bed-linen that is damp be slept in? 683. When should change of dress from thick to thin be made? Why? -=-=-=-=-=-=-=-=-=-=-=-= 684. _When the clothing has become wet, it is best to change it immediately._ The skin should then be rubbed with a dry crash towel, until reaction, indicated by redness, is produced. If the garments are not changed, the person should exercise moderately, so that sufficient heat may continue to be generated in the system to dry the clothing and skin without a chill. Sitting in a cool shade, or current of air, should, by all means, be avoided; as colds are not contracted by free and excessive exercise, but by injudicious management after such exercise. _Observation._ When an individual has been thrown into a profuse perspiration by violent exercise, though the skin and clothing may become wet, he feels no inconvenience from the dampness, as long as he continues that amount of exercise for the reason that the circulation of the blood being increased heat is generated in sufficient quantity to replace the amount abstracted from the system in evaporating the free perspiration; but as soon as the exercise is discontinued, the increased circulation subsides, and with it the extra amount of generated heat. This accounts for the chill we experience, when the damp clothing is permitted to dry on the body, after the cessation of exercise. -=-=-=-=-=-=-=-=-=-=-=-= 684. What suggestion when the clothing has become wet? What should be done if the garments are not changed? What causes the chill that is experienced when damp clothing is permitted to dry on the body? -=-=-=-=-=-=-=-=-=-=-=-= CHAPTER XXXIV. HYGIENE OF THE SKIN, CONTINUED.