Nothing causes chills more than hot, stuffy rooms. We often hear people complaining that they took cold when they came out into the night air. Yet it was not the night air which did the mischief, but the poisonous atmosphere in the room itself, due to the accumulated exhalations of many lungs, etc. Had the apartment been well ventilated the so-called chill would never have occurred. Most cases of asthma are the result of a bad atmosphere. The catarrh has extended down from the nose and throat into the bronchial tubes, and set up a spasm which is the source of this distressing malady. No asthmatic can afford to keep his windows closed. Whether by day or night, he needs a liberal supply of fresh air. It is not so much by day that people suffer from the effects of poor ventilating. For then most of us are compelled by the force of circumstances and the exigencies of our work to move about from one place to another, even if it is only from room to room. It is in the evenings, and winter evenings in particular, that the atmosphere of the dwelling-rooms becomes contaminated. The family sits by the fireside, with the windows and door closed, and they never notice how stuffy and close the room is becoming, until someone comes in from the outside air and beseeches them to open the window. Yet they go on sitting in that poisoned air, and one or two of them become drowsy and sit half asleep, with the result that when bedtime comes they have to face a restless night. Others, perhaps, find their heads aching, and attribute it to the fact they are working too hard during the day. But it is only when they go to bed in rooms with the windows closed that the chief harm comes. Considering what a large proportion of our lives we spend in our bedrooms, it is of vital importance that the air should be, if anything, purer than that of the rooms we live in by day. For at night we are not moving about, but lying still, and the air does not get a chance of renewing itself unless the ventilation is efficient. Many people complain that they can scarcely wake up in the mornings, they feel so heavy. Or that when they do rouse themselves they have a headache, which it takes hours to get rid of. All this might be avoided by the use of the open window. The objection to it generally consists in the fact that it makes a draught. There is no necessity for this, however. There are some cranks who have much to account for in regard to this matter. They boast that they can sleep close to a window which is open top and bottom to its fullest extent, and are proud to say that they have waked up in the morning to find that the rain had been coming in and had soaked the bedclothes through and through.