. Un guide de référence des sciences médicales : englobant toute la gamme des connaissances scientifiques et pratiques de la médecine et des sciences connexes. forcé vers l'intérieur, dis-plaçant l'air déjà dans l'immeuble, theterm propxdsion est utilisé. Ces modalités d'areanalogueous les termes l'aspiration et l'perfla-tion, déjà évoqué dans le cadre des dispositions de l'action de vents. L'extraction est effectuée à l'aide de vapeur, ofheat-jets, fans, roues, pompes, ou theArchimedean vis. L'action de heal a été expliqué de whenspeaking les positions des points de vente et de l'air du boitier répartiteur. Dans les cas visés à l,le feu est placé à la bo

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. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. forced in, dis-placing the air already in the building, theterm propxdsion is used. These terms areanalogous to the terms aspiration and perfla-tion, already referred to in connection withthe action of winds. Extraction is accomplished by means ofheat, steam-jets, fans, wheels, pumps, or theArchimedean screw. The action of heal has been explained whenspeaking of the positions of outlets and thedistribution of air. In the cases referred to, fire is placed at the bottom of a chimney ;flues with steam-coils or jets of gas are usedfor the same purpose. Sometimes the heat-ing power is placed near the top of the flueor chimney ; this is a bad plan, as the hot airescapes after acting upon a short section ofthe chimney instead of the whole length. Inchurches, public halls, and other buildingswhere numerous gas-jets are employed forlighting purposes, they might more frequently be takenadvantage of for ventilating, instead of being allowed tovitiate the atmosphere. Those who have had occasion to. ?heet-metal Flue connecting with the Stove-pipe. 624 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. Ventilation.Ventilation. visit a printing-office at night can testify to the unwhole-some condition of the atmosphere, especially if the visi-tor has come into the office directly from the fresh outerair when the office is in full blast. There is a gas-jet toevery compositor, or, at least, to every two compositors ;each of these jets vitiates the atmosphere about as muchas two men. The workmen usually have a choice be-tween chilling draughts and a terribly vitiated atmos-phere. If a small funnel (which would also reflect thelight downward) were placed mouth downward over eachjet, with a piece of inch-tube running upward from theapex, these several tubes connecting with a larger centraltube, and this with the outer air, a vast change would beeffected. Steam je

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