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42 school-room, or in your own private chamber, remember the imperative necessity for breathing air that is liberally supplied with oxygen.

Perhaps you fear cold air. A draught may have all sorts of diseases in its grasp. When I first began the study of hygiene and health many years ago, I was continually puzzled by the average person's fear of draughts. Draughts are currents of air. But one could meet a current of air on any windy day. Then later it was explained that a draught was a current of cold air in a warm room. In other words, if one is in a warm atmosphere and a cold current of air comes in contact with one part of his body, while other parts are encompassed in warm air, this cold air is supposed to be a draught. But whenever one leaves a warm room the face and hands or other parts not covered would come in direct contact with this cold air, while the covered parts remained in the warm air, retained by the clothing; therefore, any time one goes out in cold weather he submits himself to exactly the same conditions as when