. Ventilation for dwellings, rural schools and stables. s more of moisture. The oxy-gen has been decreased from a volume per cent of toone of about , thus leaving it only three-fourths asrich in its essential food element. This reduction of theoxygen content of the air, first by the direct consumptionof it and, second, by its dilution through the addition ofother ingredients and by expansion due to rise in temper-ature, must be the main change which reduces its sustain-ing power. Indeed breathing becomes difficult so soon as Composition of Once Breathed Air. 15 the volume per cent o
. Ventilation for dwellings, rural schools and stables. s more of moisture. The oxy-gen has been decreased from a volume per cent of toone of about , thus leaving it only three-fourths asrich in its essential food element. This reduction of theoxygen content of the air, first by the direct consumptionof it and, second, by its dilution through the addition ofother ingredients and by expansion due to rise in temper-ature, must be the main change which reduces its sustain-ing power. Indeed breathing becomes difficult so soon as Composition of Once Breathed Air. 15 the volume per cent of oxygen in the air has fallen as lowas 13, so that breathing the air but twice would carry thevolume per cent of oxygen belowthis limit, indeed as low as 10 percent if no fresh air were addedto it. We have seen with what dimin-ished brilliancy a magnesium rib-bon burns in air once is perhaps a more convincingconcrete demonstration of the lossof power to support combustionand to sustain bodily functionswhir^h chnrMcatcrizes respired
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectventilation, bookyear
