Heating Buildings and Ventilation. annual report just published presents a con siderable amount of information of very gene ral interest which deserves special notice on He condemns the use of hot air furnaces now so common because of their dangerous charac ter in respect to fires but more so on sanitary considerations. When imperfectly construct be so built as to avoid this danger but they are always prejudicial to health. It is stated that in the public schools in which they are employed they produce injury to the health of the scholars the teachers having to allow numbers of them to go home frequently before the hour of dismissal on account of severe headaches. For this reason they are con demned and the abjuration of their use re commended and as a substitute for them re garding both health and safety the heating with hot water by pipes is advocated. in heating apartments is the frequent cause of fires of nervous fevers and lung diseases. In very cold weather the plates of these fur naces are generally heated red hot and as a consequence the air which comes in contact with them is decomposed and rendered unfit pipes distributed through a schoolroom or any other apartment remedy the evil of headaches without the use of other agencies ? We are confident they will not. He has overlooked the main cause of the health evils in school rooms namely the absence of arrangements for proper ventilation. Unless means are em ployed for a constant supply of pure fresh air evident this system must be more hurtful to the health of children in overcrowded schools than the present hot air furnaces. These lat and throw it into the rooms and if some of air is also supplied and thus the foul air has not to be ruminated by the lungs as in rooms heated by stoves and steam and water pipes unprovided with the means of furnishing fresh air. The correct method of heating rooms is to throw a constant stream of fresh warm air into them. By keeping hot air furnaces at a moderate temperature s
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