The solution of this problem is not to heat the air in the room, but to use your steam coils to heat fresh air, and then drive this air, already warmed, into the room, at the same time providing a vent through which the old air can be pushed out. This is the hot air system of heating, and it requires some kind of engine or dynamo, and therefore is expensive. It has been installed in a few office buildings and theaters. One of the most perfect systems I ever inspected is in the building of the New York Stock Exchange, where the air is warmed in winter, and cooled in summer, and freed from dust, and exactly the right quantity is supplied. It is a humorous commentary upon our civilization that we take perfect care of the breathing apparatus of our stock-gamblers, but pay no attention to the breathing apparatus of our senators and congressmen, whose one business in life is to use their lungs. The stately old building with its white marble domes looks impressive in moving pictures and on illustrated postcards, but it has no system of ventilation whatever, and is a death-trap to the poor wretches who are compelled to spend their days, and sometimes their nights, within its walls. This contrast is one symptom of the rise of industrial capitalism and the collapse of political democracy. We have reserved to the last a method of heating which is the worst, and can only be described as a crime against health: the use of gas and oil stoves set out in the middle of the room, without a vent, and discharging their fumes into the room. These stoves are simply instruments of slow death, and their manufacture should be prohibited by law. In the meantime, what you have to do is to refuse to live in a room or to work in an office where such stoves are used. I have heard dealers insist that this or the other kind of gas or oil stove was so contrived as to consume all the fumes. Do not let anybody fool you with such nonsense. There has never been any form of combustion devised which consumes all the fumes. No such thing can be, because the products of combustion are not combustible. The so-called "wickless blue flame" stoves do burn all the oil, and a properly regulated gas stove will burn all the gas, but that simply means that it turns the oil and gas into carbon dioxide, the very substance which your lungs are working day and night to get out of your body.