Unconsciousness.--There are two opposite causes of unconsciousness. One is congestion of the brain, the other sheer nerve exhaustion. Either will produce a prolonged suspension of consciousness very different from a mere passing faint. In the case of congestion, the head will be hot and the feet cold. The cure is therefore at once seen to be to cool the head and foment the feet in a hot blanket up to the knees. This is the treatment usually to be given to young children. When aged people, or those much exhausted from any cause, become unconscious from lack of vitality, there will be rather a _general_ coldness, and no special heat in the head. We have seen such a case of "coma," which had lasted for forty-eight hours, come all right in ten minutes, by simply fomenting the back of the head and neck, and all down the spinal column. Press a thickly-folded piece of flannel wrung out of hot water carefully and gently over these parts, and often in a few minutes the mental power comes back. Care must be taken not to scald the patient. _See_ Fomentation. Underwear.--There is a common and very popular error, namely, that of putting too much clothing on our bodies, under the mistaken idea that additional weight means additional warmth. The fact that the main object of clothing is to preserve the natural heat of the body is lost sight of, and little attention is paid to the selection of proper garments for wearing next the skin. Every day the skin of an average healthy individual gives off so many pints of moisture, which must not be allowed to settle on the body if health is to be maintained. After long and exhaustive trials, we have come to the conclusion that the best material for wearing next the skin is knitted linen, and the best knitted linen of the kind, and in fact, the only pure linen mesh material which we have seen, is known as _Kneipp linen_, and can be obtained from all leading retailers and outfitters in this and other countries. The name of the nearest agent may be had by sending a card to the Kneipp Linen Warehouse, 2 Milk St., London, E.C. In winter light woollen underwear can be worn over the linen if desired, thus retaining the hygienic advantages of the linen, as well as the warmth of the wool. As the wool does not touch the skin, it will not require frequent washing, and so will not become felted up. Linen is the symbol of cleanliness, the priests of old, as we read in Ezekiel, being commanded to wear it, and not wool or any garment causing sweat. Our reason for specially naming Kneipp linen is that we know it is _pure linen_, whereas we know that what is sold as linen mesh is frequently half linen and half cotton.