Popular Education

We open sewers for matters that offend the sight or the smell, and contaminate the air. We carefully remove impurities from what we

y individual in the promiscuous crowd-exhalations offensive, to a certain extent, from the most healthy individuals; but when arising from a liv

supporting life. It is distributed from the left side of the heart all over the body by means of a great artery, which subdivides in its course, and ultimately terminates in myriads of very minute ramifications closely interwoven with, and in reality constituting a part of, the texture of every living part. On reaching this extreme point of its course, the blood passes into equally minute ramifications of the veins, which in their turn gradually coalesce, and form larger and larger trunks, till they at last terminate in two large veins,

the second by the important process of respiration, which takes place in the air-cells of the lungs. The venous blood, having arrived at the right side of the heart, is propelled by the contraction of that organ into a large artery, leading directly, by separate branches, to the two lungs, and hence called the pulmonary artery. In the innumerable branches of this artery expanding themselves throughout the substance of the lungs, the dark blood is subjected to the contact of the air inhaled in breathing, and a change i

right side of the heart to the lungs, and back to the left side of the heart. The former has for its object nutrition and the maintenance of life; and the latter, the restoration of the deteriorated blood, and the animalization or assimilation of the c

well deserves the most careful examination. The term respiration is frequently restricted to the mere inhalation and expiration of air from the lungs, but more generally it is employed to designate the whole series of phenomena which occur in these organs. The term sanguification is occasionally

lumpness till the full supply of blood be restored. In like manner, when the quality of that fluid is impaired by deficiency of food, bad digestion, impure air, or imperfect sanguification in the lungs, the body and all its functions become more or less disordered. Thus, in consumption, death takes place chiefly in

, however, the requisite action is effected without the intervention of lungs. In fishes, for example, that live in water and do not breathe, the blood circulates through the gills, and in them is exposed to the air which the water contains. So necessary is the atmospheric

the cavity of the chest. They vary much in size in different persons; and as the chest is formed for

bes. When fully distended, they are so numerous as in appearance to constitute almost the whole lung. They are of various sizes, from the twentieth to the hundredth of an inch in diameter, and are lined with an exceedingly fine, thin membrane, on which the minute capillary branches of the pulmonary arteries and veins are copiously ramified. It is while circulating in the small v

uvia, with which it is loaded when returned from the lungs. In some individuals this last source of impurity is so great as to render their vicinity offensive, and even insupportable. It is this which gives the disagreeable, sickening smell to crowded rooms. The air which is expired from the lungs is rendered offensive by various other causes. When spirituous liquors are taken into the stomach, for example, they are absorbed by the veins and mixed with the venous blood, in which they are carried to the lungs to be expelled from the body. In some instances, when persons

d with the fumes of spirits, tobacco, turpentine, or of any other volatile substance, a portion of the fumes is taken up by the absorbing vessels of the lungs, and carried into the system, and there produces precisely the same effects as if introduce

portant function of respiration. The first among these is a healthy original formation of the lungs. No fact in medicine is better established, says Dr. Combe, than that which proves the hereditary trans

speedily suffer, and that often to a fatal extent. The free and easy expansion of the chest is also indispensable to the full play and dilation of the lungs. Whatever interferes with or impedes it, either in dress or in position, is obviously prejudicial to health. On the other hand,

antage does not stop there, the beneficent Creator having kindly so ordered it that the same exercise shall be scarcely less advantageous to the important function of respiration. Active exercise calls the lungs into play, favors their expansion, promotes the circulation of the blood through their substance, and leads to their complete and healthy development. The same end is greatly facilitated by that free and vigorous exercise of the voice, which so uniformly a

requisite changes in the constitution of the blood, as it passes through the lungs, can not be effected. To en

t seventy-eight per cent. of nitrogen, twenty-one per cent. of oxygen, and not quite one per cent. of carbonic acid. Such is its constitution when taken into the lungs in the act of breathing. When it is expelled from them, however, its composition is found to be greatly altered. The quantity of nitrogen remains nearly the same, but eight or eight and a half per cent. of the

ained in the air we breathe, and that air is fit or unfit for respiration in exact proportion as its quantity of oxygen approaches to, or differs from, that contained in pure air. If we attempt to breathe nitrogen, hydrogen, or

too rapid, and the system generally becomes highly excited. Diminish the proportion of oxygen, and the circulation and respiration become too slow, weakness and lassitude ensue, and a sense of heaviness and uneasiness pervades the entire system. As has been observed, air loses during each respiration a portion of its oxygen, and gains an equal quantity of carbonic acid, which is a

it remembered, is an active poison. Says Dr. Turner, in his celebrated work on chemistry, "An animal can not live in air which is unable to support combustion." Says the sa

t entered the lungs of myself and four young men was thirty-six cubic inches, and that respiration is repeated once in three seconds, or twenty times a minute. I also ascertained that respired air will not support combustion. This truth, taken in connection with the quotations just made, establishes another and a more important truth, viz.,

eneath the surface of the same fluid in another vessel. I next removed the water from the receiver by breathing into it. This was done by filling the lungs with air, which, after being retained a short time in the chest, was exhaled through a siphon (a bent lead tube) into the receiver. I then introduced the lighted taper into the receiver of respired air, by which it was immediately exti

few school-houses less than sixteen by eighteen feet on the ground, and fewer still larger than twenty-four by thirty feet, exclusive of our principal cities and villages. From a large number of actual measurements, not only in New York and Michigan, but east of the Hudson River and west of the great lakes, I conclude that, exclusive of entry and closets, when they are furnished with these appendages, school-

ife, and the quantity of air that enters the lungs at each inspiration, that a school-room of the preceding dimensions contains quite too little air to sustain the healthy respiration of even

oom was estimated to possess a capacity of 3360 cubic feet-fifteen feet less than is necessary to sustain healthy respiration. 4. Were forty-five persons whose lungs possess the estimated capacity placed in an air-tight ro

ntly narrowed, that the warm breath may lessen the amount of fuel necessary to preserve a comfortable temperature. It is true, on the other hand, that the quantity of air which children breathe is somewhat less than I have estimated. But the derangement resulting from breathing impure air, in their case, is greater than in the case of a

eing more perceptible, would be seen and felt too, and a remedy would be sought and applied. But because the change is gradual, it is not the less fearful in its consequences. In a room occupied by forty-five persons, the first minute, thirty-two thousand four

so many teachers who are justly considered both pleasant and amiable in the ordinary domestic and social relations, are obnoxious in the school-room, being there habitually sour and fretful. The ever-active children are disqualified for study, and engage in mischief as their only alternative. On the other hand, the irritable teacher, who c

it was acknowledged by competent judges to be emphatically true in the case of not less than twenty-five scholars. Indeed, in that same district, the health of more than one hundred scholars was materially injured every year in consequence of occupying an old and partially-decayed house, of too narrow dimensions, with very limited facilities for ventilation. Th

in almost any other business. If this statement were not true, an unanswerable argument might be framed against the very existence of schools; and it might clearly be shown that it is policy, nay, duty, to close at once and forever the four thousand school-houses of Michigan, and the hundred thousand of the nation, and l

o be healthy." I made no reply, but secretly resolved that I would sacrifice my comfort for the remainder of the afternoon, and hazard my health, and my life even, to test the accuracy of the opinions I had entertained on this important subject. I marked the uneasiness and dullness of all present, and especially of the patrons, who had been accustomed to breathe a purer atmosphere. School continued an hour and a half, at the close of which I was invited to make some remarks. I arose to do so, but was unable to proceed till I opened the outer door, and snuffed a few times the purer air without. When I had partially recovered my wonted vigor, I observed with

and the candles went almost out." Little did they realize, probably, that the light of life became just as nearly extinct as did the candles. Had they remained there a little longer, both would have gone out together, and there would have been

our most eminent practical educators, some of whom had written upon the subject at an earlier date. Allen and Pepy showed by experiment that air which has been once breathed contains eight and a half per cent. of carbonic acid, and that no c

orant at present, ought to be well informed, they would be the proper adaptation of food to difference of age and constitution, and the constant supply of pure air for respiration." Dr. William A. Alcott, who has given

his food and drink." There is some novelty in this remark, I admit: but is it not truthful? Men have been known to live three weeks without eating. But exclude the atmospheric air from the lungs

t of uninterrupted good health. But we involuntarily breathe nearly thirty thousand times in the same length of time. We need, then, fresh supplies of pure a

espired air until it has been purified and restored to its natural and healthful state; for carbonic acid, the vitiating product of respiration, although immediately fatal to animals, constitutes the very life of vegetation. When brought in contact with the upper surface of the green leaves of trees and plants, and acted upon by the direct solar rays, this gas is decomposed, and its carbon is absorbed to sustain, in part, the life of the plant, by affording it one element of its food, while the oxygen is liberated and restored to the atmosphere. Vegetables and animals are thus perpetually interchanging kindly offices, and each flourishes upon that which is fatal to the other. It is in this way that the healthful state of the atmosphere is kept up. Its equilibrium seems never to be disturbed, or, if disturbed at all, it is immediately restored by the mutual exchange of poison for aliment, which is constantly going on between the animal and vegetable worlds. This interchange of kindly offices is constantly going on all over the earth,

tion of vegetable products. Dr. Arnott expresses the conviction that the immediate and chief cause of many of the diseases which impair the bodily and mental health of the people, and bring a considerable portion prematurely to the grave, is the poison of atmospheric impurity, arising from the accumulation in and around their dwellings of the decomposing remnants o

ere was described to us one vast lodging-house, in connection with a manufactory there, in which formerly fever constantly prevailed, but where, by making an opening from the top of each room through a channel of communicati

"is extremely deleterious.[16] When respired in a pure state it kills instantly; and its deadly agency is rapidly exerted when put in contact with any of the tissues of the body, through which it penetrates with astonishing rapidity. Even when mixed with a portion of air, it has proved immediately destructive. Dr. Paris refers to the case of a chemist of hi

e poisonous. Some of these exhalations are more abundant in the night, and about the time of the morning and evening twilight. "Hence the importa

daytime. All, therefore, who would retain and improve their health, should inhale the open air as much as possible, even though they ca

ble degree, his health and longevity. We must avoid breathing over the carbonic acid gas contained in the tight or unventilated rooms in which we labor or remain for a long time, whether parlors, school-rooms, counting-rooms, bed-rooms, shops, or factories. The individual who lives most according to nature-who observes with most care the laws of life and health-must necessarily throw off much carbonic a

it, and learning to avoid the causes which produce it. Such a person will not neglect long to remove the impurities which accumulate so readily on the surface of his body, or suffer himself to use food or drink which induces flatulence, and thus exposes either his intestines or his lungs, or the lungs of others, to that most extremely poisonous agent, sulphureted hydrogen gas. Nor will he be likely to permit the accumulation of filth, liquid or solid, around or in his dwelling. There are those whose senses will detect a very small quantity of stagnant water, or vinegar, or other liquids, o

omoting their development and warding off their diseases. In this respect the organs of respiration closely resemble the muscles and all other organized parts. They are made to be used

d. Rowing a boat, fencing, quoits, shuttlecock, the proper use of skipping the rope, dumb-bells, and gymnastics are of this description, and have been recommended for this purpose. All of them employ actively the muscles of the chest and trunk, and excite the lungs themselves to freer and fuller expansion. Climbing up a hill is, for the same reason, an exercise of high utility in giving tone and freedom to the pulmonary

it. As a preventive measure, Dr. Clark, in his treatise on Consumption and Scrofula, recommends the full expansion of the chest in the following manner: "We desire the young person, while standing, to throw his arms and shoulders back, and, while in this position, to inhale slowly as much air as he can, and repeat this exercise at short

isy exclamations attending the sports of the young have an evident relation to the same beneficial end, and ought, therefore, to be encouraged." But beneficial as the direct exercise of the lungs is thus shown to be, in expanding and strengthening the chest, its influence extends still further, and, as we h

isease, but tend greatly to promote the general health. For this purpose, also, as well as for its social and moral influences, vocal music should be introduced into all our schools. That by th

med, we know that motion impedes its recovery. When the eye is affected, we, for a similar reason, shut out the light. So, when the stomach is disordered, we respect its condition, and are more careful about diet. The lungs demand a treatment founded on the same general pri

t deep inhalations of air. By this means the carbonic acid, which the returning circulation deposits in the lungs, is not only more effectually disengaged, but, at the same time, the greater amount of oxygen that

ng, he says, "the chest should be carried proudly erect and straight, the top of it pointing rather backward than forward." To illustrate the advantages of habitually maintaining this position, he refers to the North American Indians, who never had consumption, and who are remarkable for their perfectly erect posture while walking. "Next to this," he adds, "it is of vast importance to the consumptive to breathe well. He should make a practice of taking long breaths, sucking in all the air he can, and holding it in the chest as long as possible." He recommends the repetition of this a hundred times a day, and especially with those who have a slig

use of "shoulder-braces." He says the proper use of these, with other remedies, will "entirely prevent the possibility of consumption, from whatever cause." The inhaling-tube, together with the shoulder-braces and supporter when needed, he says are perfect preventives, and should

rs." He has, moreover, in the plenitude of his goodness, furnished each member of the human family with a good pair of shoulder-braces. It should also be borne in mind that Nature's shoulder-braces improve by use, while the artificial ones not only soon fail, but their very use generally impairs the healthy action of the natural ones; for these, like all other muscles, improve by use and become enfeebled