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Therefore, an equal bodily temperature should be maintained by exercise, by clothing, or by fire. 917. Exercise and Clothing. Exercise warms, invigorates and purifies the body; clothing preserves the warmth the body generates; fire imparts warmth externally. Therefore, to obtain and preserve warmth, exercise and clothing are preferable to fire. 918. Ventilation. Fire consumes the Oxygen of the air, and produces noxious gases. Therefore, the air is less pure in the presence of candles, gas, or coal fire, than otherwise, and the deterioration should be repaired by increased ventilation. [SO THE LOVELIEST WOMAN MAY LACK VIRTUE.] 919. Clean Skin. The skin is a highly-organized membrane, full of minute pores, cells, bloodvessels, and nerves; it imbibes moisture or throws it off, according to the state of the atmosphere and the temperature of the body. It also "breathes," as do the lungs (though less actively). All the internal organs sympathize with the skin. Therefore, it should be repeatedly cleansed. 920. Over-Work. Late hours and anxious pursuits exhaust the nervous system, and produce disease and premature death. Therefore, the hours of labour and study should be short. 921. Body and Mind. Mental and bodily exercise are equally essential to the general health and happiness. Therefore, labour and study should succeed each other. 922. Over-Indulgence. Man will live most healthily upon simple solids and fluids, of which a sufficient but temperate quantity should be taken. Therefore, over indulgence in strong drinks, tobacco, snuff, opium, and all mere indulgences, should be avoided. 923. Moderate Temperature.