Our little men and women; modern methods of character building; . with-standing, find their way into the lungs. But what is the main defect in the air of rooms poorly ven-tilated that makes it depressing and unfit to breathe ? Investi-gations have been numerous, seeking to determine what arethe constituents of expired air that make it popular belief is that it is due to the presence of careful experimental investigations have proven conclu-sively that only under extremely extraordinary conditions isthe amount of CO. in a room in which people are living, or ina classroom
Our little men and women; modern methods of character building; . with-standing, find their way into the lungs. But what is the main defect in the air of rooms poorly ven-tilated that makes it depressing and unfit to breathe ? Investi-gations have been numerous, seeking to determine what arethe constituents of expired air that make it popular belief is that it is due to the presence of careful experimental investigations have proven conclu-sively that only under extremely extraordinary conditions isthe amount of CO. in a room in which people are living, or ina classroom or lecture-room, sufficient to affect, in any detect-able manner, the physiological processes or mental work of anindividual. Indeed, only a few instances are on record inwhich the ratio of eight parts in ten thousand—the allegedperfectly safe normal ratio—has been exceeded. Artificialventilating systems which supply above one thousand fivehundred cubic feet of air per hour for each inmate easily keepthe quantity of CO2 below the required ratio. The Massa-. OPEN AIR SCHOOLS 285 chusetts law requires that the inflow of fresh air per personshall exceed eighteen hundred cubic feet, so that in classroomsthe air practically never contains an injurious excess of car-bonic-acid gas. Pure air, moreover, does not imply that air shall be rich inoxygen and ozone. More oxygen does not necessarily meanmore vitality. Concentrated doses of oxygen, indeed, inamounts of one part to two hundred and fifty, act as a poisonon the human organism. They induce convulsions, inflamma-tion of the lungs, and death. There is a small quantity offree ozone, to be sure, in the air, but ordinarily this does notreach the lungs; it is caught by the organic matter in the airpassages leading to the lungs, oxydizing it and helps, there-fore, to purify the air, but even a normal quantity of freeozone in the air may induce nasal catarrh, bronchitis, andasthma by the constant irritating of the mucous surfaces wit
Size: 1203px × 2077px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidourlittlemen, bookyear1912
