Combs of tortoise-shell, bone, or rubber, with not very sharp teeth, should be used. Sharp teeth injure the scalp and produce dandruff. Two brushes, one hard, to clean the hair and scalp, and the other soft, to smooth and polish, are best. Clean brushes by rubbing them with bran, or wash with one part ammonia and two of water. Combing or brushing should be done in the natural direction of the hair, and never against it. In the proper way it can not be brushed too much. To keep the scalp clean wash in tepid soft water with a little pure soap in it, rinse in pure water, dry with towels and then in the sun or by the fire. Oily hair may be washed once a week, light hair less often. Some occupations require that it should be washed much oftener. All preparations for the hair are more or less injurious. Healthy hair has enough oil of its own, and the application of foreign oil destroys its vitality. Preparations containing alcohol fade hair and make it brittle. The only time when oil is admissable is after washing. The best preparation is one part of glycerine to three of rose-water. Powders made of starch, when used, must be washed out of the hair to prevent injury. Those made of colored glass are very injurious, cutting and otherwise damaging the hair. At night, the hair should be loosened and left free. Night-caps are a relic of barbarism. Hair dyes are very injurious, as they all contain more or less sugar of lead, nitrate of silver, and other ingredients, which affect the brain, produce paralysis, inflammation of the eyes, and impairment of sight. Gray hairs are an indication that the hair-producing organs are weakening. When found they should be cut down to the healthy part, and the head should be exposed as much as possible, except in the middle of the day, to the sun and air. When hair falls out, it indicates a disease of the scalp. To cure, dip the head twice a day in cold water and rub with a brush until a glow is produced. In case the hair is too long to wet brush until a glow is produced, and then rub into the roots a wash made of three drachms of pure glycerine and four ounces of lime-water.