| Show ventilation OF THE school no ab people are quite ready to acknowledge I 1 the he necessity essit esbit of an abundant and pure supply i of air but they recognise recognize the abstract principle principal pl e far more readily ily than they act upon it in former times when building were much more oben open oden onen than at present resent when the broad I 1 throats of huge fireplaces fire places yawned dawned across half the side of a room and received within their jaws jan jav vs for a single fire a pile of wood sufficient to supply a stove store for a week when ever every y window and door clattered in its frame and admitted the outside atmosphere in quantities ample enough to make up for the draft of the chi chimney niney and the breathings brea things of the inmates there was no nece necessity amity for entering into any scientific arrangements for ventilation the very absence of science in construction obviated its necessity and made up for all deficiencies but at the present day when brick and ston stone c are constructed into air proof walls when hen doors fit their casings and win gin windows doirs their i frames in perfect joints when roof and beilin ceiling at and id partition allow neither of admission nor exit for a breath of air it is all important that i attention of the builder be called to the subject act of ventilation E specially especially should this be ahe the case in schoolhouses school houses and churches where large numbers of persons are con congregated ert irl fated gated put one hundred pupils in any schoolroom school room and let the ventilators rs be closed for half a day I 1 and a person entering it from the fresh free air of the street will ivill perceive instant instantly a very offensive and depressing atmosphere it contains all the elements of a subtle poison and one which carried to a higher degree of concentration cent ration would produce almost instantaneous death bad ventilation produces ill consequences in two ways first by depriving 11 the thet respiratory organs of the necess necessary ag supply of oxygen and secondly se cony by substituting a poison in the shape of carbonic acid in its stead the former gas inhaled in the air supports in the animal system tem a slow combustion of the carbon elaborated from the food and carried into the circulation the result of this combustion in the animal economy as in a fireplace fire place is carbonic acid accompanied by bythe the evolution of heat and the new gas is then exhaled in place of the exhausted oxygen provision must be made for its removal removal and for a fresh supply of oxygen or disease and death will ensue there are more scholars twice told injured we venture to say by sitting in ill ventilated schoolrooms school rooms than by over mental or deficient physical exertion rural new yorker |
