Connected with cleanliness of clothing, as a means of health, is personal cleanliness. Perfected action of the skin, so essential to the perfect life, can only be obtained by thorough ablution of the whole body. The ablution ought, strictly, to be performed once in every twenty-four hours. It is best to train the body to the use of cold water through all seasons, so that the requirement for water of raised temperature may not become a necessity. The simplest and best bath is the ordinary sponge-bath. Plungings, splashings, showers, and the like are mere pastimes. The occasional use of the hot air or Turkish bath is an important adjunct to the means of maintaining health.
["Physiology, Experimental and Descriptive," by Buel P. Colton, Professor of Natural Science in the Illinois State Normal University, is a capital text-book which may be read as gainfully at home as in school or at college. Throughout its chapters are excellent directions for the care of health and strength. It is published by D. C. Heath & Co. Boston. 1898. The following extract was revised by Dr. Casey A. Wood, an eminent oculist of Chicago]
In reading we wish light from the printed page. Hence we should avoid light entering the eye from any other source at this time. While reading, then, do not face a window, another light, a mirror, or white wall, if it can be avoided. In a room, white walls are likely to injure the eyes. Choose a dark colour for a covering for a reading table. Sewing against the background of a white apron has worked serious mischief. Direct sunshine near the book or on the table is likely to do harm.
Preferably have the light from behind and above. Many authors say "from the left" or "over the left shoulder." In writing with the usual slant of the letters this may be desirable. But vertical writing is now strongly advocated, as it enables one to sit erect, and have the light from above and equally to the two eyes. Having stronger light for one eye than for the other is bad. Sitting under and a little forward of a hanging lamp will give the light equally to the two eyes and send no light direct into the face. In reading by daylight avoid cross-lights as much as possible. The incandescent electric light has an advantage in being readily lighted without matches, and in giving out little heat, thus making it valuable for house-lighting; but owing to its irregular illumination (due to the shadow cast by the wire or filament), it is not well suited for study or other near work. For this purpose an Argand gas or kerosene burner is much to be preferred, since it throws a soft, uniform, and agreeable light upon the work.