“…They may seem to improve, but that is because the eyes adjust themselves to bad conditions which should be remedied before the delicate organs are permanently injured. Headaches are an early sign of eye strain, and "bilious attacks," too, may arise from the same cause. …”

“…If kept clean, it relieves the internal organs of a great deal of work. The skin, under ordinary conditions of external temperature, gets rid of about two pints of water in the form of sweat during the 24 hours — more in hot weather and on occasions of great exertion; and this sweat contains solid matter, salts, fats, waste products and other impurities. …”