  Few people take sufficient pains to preserve the air in any of their apartments pure; for few know what the constitution of our atmosphere is, and in how many ways and with what ease it is rendered impure. It is not my purpose to go into a learned, scientific account in this place, or even in this work, of the constitution of the atmosphere. A few plain statements are all that are indispensable. The atmosphere which we breathe is composed of two different airs or gases. One of these is called oxygen, [Footnote: Oxygen gas is the chief supporter of combustion, as well as of respiration. It is the vital part, as it were, of the air. No animal or vegetable could long exist without it. And yet if alone, unmixed, it is too pure and too refined for animals to breathe. Nitrogen gas, on the contrary, while alone, will not support either respiration or combustion; mixed, however, with oxygen, it dilutes it, and in the most happy manner fits it for reception into the lungs.] and the other nitrogen. There is another gas usually found with these two, in smaller quantity, called carbonic acid gas; but whether it is necessary, in a very small quantity, to health, chemists, I believe, are not agreed. One thing, however, is certain—that if any portion of it is healthful, it must be very little—not more, certainly, than one-fiftieth or one-hundredth of the whole mass. It is by means of the oxygen it contains, that air sustains life and combustion. Were it not for this, neither fires nor candles would burn, and no animal could breathe a single moment. Breathing consumes this oxygen of the air very rapidly. When the oxygen is present in about a certain proportion, combustion and respiration go on well, but when its natural proportion is diminished, the fire does not burn so well, neither does the candle; and no one can breathe so freely. Not only are breathing and combustion impeded or disturbed by the diminution of oxygen in the atmosphere, but just in proportion as oxygen is diminished by these two processes, or either of them, carbonic acid is formed, which is not only bad for combustion, but much worse for health. If any considerable quantity of it is inhaled, it appears to be an absolute poison to the human system; and if in very large quantity, will often cause immediate death. It is this gas, accumulated in large quantities, that destroys so many people in close rooms, where there is no chimney, nor any other place for the bad air to escape. But it not only kills people outright—it partly kills, that is, it poisons, more or less, hundreds of thousands. In a nursery there is the mother and child, and perhaps the nurse, to render the air impure by breathing, the fire and the lamp or candle to contribute to the same result, besides several other causes not yet mentioned. One of these is nearly related to the former. I allude to the fact that our skins, by perspiration and by other means, are a source of much impurity to the atmosphere; a fact which will be more fully explained and illustrated in the chapter on Bathing and Cleanliness. It is only necessary to say, in this place, that it is not the matter of perspiration alone which, issuing from the skin, renders the air impure; there are other exhalations more or less constantly going off from every living body, especially from the lungs; and carbonic acid gas is even formed all over the surface of the skin, as well as by means of the lungs. One needs no better proof that carbonic acid is formed on the surface of the body, than the fact that after the body has been closely covered all night, if you introduce a candle under the bed-clothes into this confined air, it will be quickly extinguished, because there is too much carbonic acid gas there, and too little oxygen. We may hence see at once the evil of covering the heads of infants when they lie down—a very common practice. The air, when pure, contains a little more than 20 parts of oxygen, and a little less than 80 of nitrogen. Breathing this air, as I have already shown, consumes the oxygen, which is so necessary to life and health, and leaves in its place an increase of nitrogen and carbonic acid gas, which are not necessary to health, and the latter of which is even positively injurious. But when the oxygen, instead of forming 20 or more parts in 100 of the atmosphere of the nursery, is reduced to 15 or 18 parts only, and the carbonic acid gas is increased from 1 or 2 parts in 100, to 5, 6, 8 or 10—when to this is added the other noxious exhalations from the body, and from the lamp or candle, fire-place, feather bed, stagnant fluids in the room, &c., &c.—is it any wonder that children, in the end, become sickly? What else could be expected but that the seeds of disease, thus early sown, should in due time spring up, and produce their appropriate fruits? It is sometimes said that fire in a room purifies it. It undoubtedly does so, to a certain extent, if fresh air be often admitted; but not otherwise. I have classed feather beds among the common causes of impurity. Dr. Dewees also condemns them, most decidedly; and gives substantial reasons for "driving them out of the nursery." In speaking of the structure of the room used for a nursery, I have adverted to the importance of having a large or double room, with sliding doors between, in order that the occupants may go into one of them, while the other is being ventilated. But whatever may be the structure of the room, the circumstances of the occupants, or the state of the weather, every nursery ought to be most thoroughly ventilated, once a day, at least; and when the weather is tolerable, twice a day. If there is but one apartment, and fear is entertained of the dampness of the fresh air introduced, or of currents, and if the mother and babe cannot retire, there is a last resort, which is for them to get into bed, and cover themselves a short time with the clothing. For though I have prohibited the covering of the face with the bed-clothes for any considerable length of time together, yet to do so for some fifteen or twenty minutes is an evil of far less magnitude than to suffer an apartment to remain without being ventilated, for twenty-four hours together—a very common occurrence. When a lamp is kept burning in a nursery during the night, it should always be placed at the door of the stove, or in the chimney place, that its smoke, and the bad airs or gases which are formed, may escape. But it is better, in general, to avoid burning lamps or candles during the night. By means of common matches, a light may be produced, when necessary, almost instantly; especially if you have a spirit lamp in the nursery, or what is still better, one of spirit gas—that is, a mixture of alcohol and turpentine. It is highly desirable that all washing, ironing, and cooking should be avoided in the nursery. They load the air with noxious effluvia or vapor, or with particles of dust; none of which ought ever to enter the delicate lungs of an infant. Fumigations with camphor, vinegar, and other similar substances, have long been in reputation as a means of purifying the air in sick-rooms and nurseries; but they are of very little consequence. Fresh air, if it can be had, is always better.
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