On awakening in the morning and several times during the day, if circumstances permit, expose your nude body to the invigorating influence of the open air and the sunlight. During the hot season of the year and in tropical countries the best time for taking air and sun baths is the early morning and the late afternoon. Persons suffering from insomnia or nervousness in any form are in nearly every case greatly benefited by a short air bath taken just before retiring, either preceding or following the evening sitz bath, as may be most convenient. Where Air Baths Should Be Taken If at all possible, air baths should be taken out of doors. Every house should have facilities for air and sun baths, that is, an enclosure where the nude body can be exposed to the open air and the sunlight. If the air bath out of doors is impracticable, it may be taken in front of an open window. But indoor air, even in a well-ventilated room, is more or less stagnant and vitiated, and at best only a poor substitute for the open air. It is the breezy, moving outdoor air, permeated with sunlight and rich in oxygen and ozone, that generates the electric and magnetic currents which are so stimulating and vitalizing to everything that draws the breath of life. This is being realized more and more, and air-bath facilities will in the near future be considered as indispensable in the modern, up-to-date house as is now the bathroom. We predict that before many years the roofs of apartment houses will be utilized for this purpose and people will wonder how they ever got along without the air bath. Our sanitarium has two large enclosures on its roof, open above and surrounded on all sides by wooden lattice work, which allows the air to circulate freely, but excludes observation from neighboring roofs and windows and the streets below. One compartment is for men and one for women, each provided with gymnastic apparatus and a separate spray room. How Air Baths Should Be Taken At first expose the nude body to cool air only for short periods at a time, until the skin becomes inured to it. Likewise, unless you are well used to the sun, take air baths of short duration, say from ten to twenty minutes, until your skin and your nervous system have become accustomed to the influence of heat and strong light. Prolonged exposure to the glaring rays of the noonday sun might produce severe burning of the skin, aside from a possible harmful effect upon the nervous system. The novice should protect head and eyes against the fierce rays of sunlight. This is best accomplished by means of a wide-brimmed straw hat of light weight. In cases where dizziness results from the effect of the heat upon the brain, a wet cloth may be swathed around the head or placed inside a straw hat.