Multitudes of public documents show that the fatality of epidemics is always proportioned to the degree in which impure air has previously been respired. Sickness and death are therefore regulated by the degree in which air is kept pure, especially in case of diseases in which medical treatment is most uncertain, as in cholera and malignant fevers.

Investigations made by governmental authority and by boards of health in this country and in Great Britain, prove that zymotic diseases ordinarily result from impure air generated by vegetable or animal decay and that in almost all cases they can be prevented by keeping the air pure. The decayed animal matter sent off from the skin and lungs in a close, unventilated bedroom is one thing that generates these zymotic diseases. The decay of animal and vegetable matter in cellars, sinks, drains and marshy districts is another cause; and the decayed vegetable matter thrown up by plowing up of decayed vegetable matter in the rich soil in new countries is another.

In the investigations made in certain parts of Great Britain, it appeared that in districts where the air is pure the deaths average 11 in 1000 each year; while in localities most exposed to impure miasma, the mortality was 45 in every thousand. At this rate, thirty-four persons in every thousand died from poisoned air, who would have preserved health and life by well-ventilated homes in a pure atmosphere. And, out of all who died, the proportion who owed their deaths to foul air was more than three fourths. Similar facts have been obtained by boards of health in our own country.

Mr. Leeds gives statistics showing, that in Philadelphia, by improved modes of ventilation and other sanitary methods, there was a saving of 3237 lives in two years; and a saving of three fourths of a million of dollars, which would pay the whole expense of the public schools. Philadelphia being previously an unusually cleanly and well-ventilated city, what would be the saving of life, health and wealth were such a city as New-York perfectly cleansed and ventilated?

Here it is proper to state again that conflicting opinions are found in many writers on ventilation, in regard to the position of ventilating registers to carry off vitiated air. Most writers state that the impure air is heavier and falls to the bottom of a room. After consulting scientific men extensively on this point, the writer finds the true result to be as follows: Carbonic acid is heavier than common air, and, unmixed, falls to the floor. But by the principle of diffusion of gases, the air thrown from the lungs, though at first it sinks a little, is gradually diffused and in a heated room, in the majority of cases, it is found more abundantly at the top than at the bottom of the room, though in certain circumstances it is more at the bottom. For this reason, registers to carry off impure air should be placed at both the top and bottom of a room.

In arranging for pure air in dwellings, it is needful to proportion the air admitted and discharged to the number of persons. As a guide to this, we have the following calculation: On an average, every adult vitiates about half a pint of air at each inspiration and inspires twenty times a minute. This would amount to one hogshead of air vitiated every hour by every grown person. To keep the air pure, this amount should enter and be carried out every hour for each person. If, then, ten persons assemble in a dining-room, ten hogsheads of air should enter and ten be discharged each hour. By the same rule, a gathering of five hundred persons demands the entrance and discharge of five hundred hogsheads of air every hour and a thousand persons require a thousand hogsheads of air every hour.

In calculating the size of registers and conductors, then, we must have reference to the number of persons who are to abide in a dwelling; while for rooms or halls intended for large gatherings, a far greater allowance must be made.

The most successful mode before the public, both for warming and ventilation, is that of Lewis Leeds, who was employed by government to ventilate the military hospitals and also the treasury building at Washington. This method has been adopted in various school-houses and also by A. T. Stewart in his hotel for women in New-York City. The Leeds plan embraces the mode of heating both by radiation and convection, very much resembling the open fireplace in operation and yet securing great economy. It is modeled strictly after the mode adopted by the Creator in warming and ventilating the earth, the home of his great earthly family. It aims to have a passage of pure air through, every room, as the breezes pass over the hills and to have a method of warming chiefly by radiation, as the earth is warmed by the sun. In addition to this, the air is to be provided with moisture, as it is supplied out-doors by exhalations from the earth and its trees and plants.

The mode of accomplishing this is by placing coils of steam, or hot water pipes, under windows, which warm the parlor walls and furniture, partly by radiation and partly by the air warmed on the heated surfaces of the coils. At the same time, by regulating registers, or by simply opening the lower part of the window, the pure air, guarded from immediate entrance into the room, is admitted directly upon the coils, so that it is partially warmed before it reaches the person: and therefore cold drafts are prevented. Then the vitiated air is drawn off through registers both at the top and bottom of the room, opening into a heated exhausting flue, through which the constantly ascending current of warm air carries it off. These heated coils are often used for warming houses without any arrangement for carrying off the vitiated air, when, of course, their peculiar usefulness is gone.

The moisture may be supplied by a broad vessel placed on or close to the heated coils, giving a large surface for evaporation. When rooms are warmed chiefly by radiated heat, the air can be borne much cooler than in rooms warmed by hot-air furnaces, just as a person in the radiating sun can bear much cooler air than in the shade. A time will come when walls and floors will be contrived to radiate heat instead of absorbing it from the occupants of houses, as is generally the case at the present time and then all can breathe pure and cool air.

We are now prepared to examine more in detail the modes of warming and ventilation employed in the dwellings planned for this work.

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About the Author

Catharine Esther Beecher (1800 - 1878) was a noted educator, renowned for her forthright opinions on women's education as well as her vehement support of the many benefits of the incorporation of a kindergarten into children's education.

Harriet Beecher Stowe (1811 - 1896) was a white American abolitionist and novelist, whose Uncle Tom's Cabin attacked the cruelty of slavery; it reached millions as a novel and play, and became influential, even in Britain.