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22 which would force them to breathe through the nose. They should also take some twenty long respirations in the open air, both in the morning and in the evening. In fact, all men can practise this simple exercise and see for themselves how rapidly their chest deepens. If the chest be measured at the beginning of the practice, and again after an interval of two months, it will be seen how much it has expanded in this short period.

After learning how to inhale the air, we should cultivate the habit of breathing fresh air, day in and day out. We are generally in the most pernicious habit of keeping confined to the house or the office throughout the day, and sleeping in narrow rooms at night, with all doors and windows shut. As far as possible, we should remain in the open air at all times. We should at least sleep on the verandah or in the open air. Those who cannot do this should at least keep the doors and windows of the room fully open at all times. The air is our food for all the twenty-four hours of the day. Why, then, should we be afraid of it? It is a most foolish idea that we catch cold by inhaling the cool breeze of the morning. Of course, those people who have spoiled their lungs by the evil habit of sleeping within closed doors are likely to catch cold, if they change their habit all on a