This section is from the "Nature Cure: Philosophy and Practice Based on the Unity of Disease and Cure" book, by Henry Lindlahr.
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.
It will be found very pleasurable and invigorating to take a cold shower or spray off and on during the sun bath and to allow the air to dry the body. This will also increase its electromagnetic effects upon the system.