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 [Pg 23] sudden. But even they should not be afraid of cold, for this cold can be speedily got rid of. Now-a-days, in Europe, the houses for consumptives are being built in such a way that they may get fresh air at all times. We know what terrible havoc is wrought in India by epidemics. We should remember that these epidemics are due to our habit of defiling the air, and of inhaling this poisonous air. We should understand that even the most delicate people will be benefitted by systematically inhaling fresh air. If we cultivate the habit of keeping the air pure and of breathing only fresh air, we can save ourselves from many a terrible disease. Sleeping with the face uncovered is as essential as sleeping in fresh air. Many of our people are in the habit of sleeping with the face covered, which means that they have to inhale the poisonous air which has been exhaled by themselves. Fortunately however, some of the air from outside does find its way through the interstices of the cloth, else they should die of suffocation. But the small quantity of air that gains entrance in this way is altogether inadequate. If we are suffering from cold, we may cover the head with a piece of cloth, or put on a night-cap, but the nose should be kept exposed under all circumstances.