A manual of hygiene and sanitation . The Trenner-Lee formaldehyde generator. air-space was completely evaporated and the room keptclosed for three or four hours. ^ In the other apparatus one pound of formalin orformochloral, from 50 to 75 of Scherings paraform tab-lets, or a quart of methyl alcohol are to be respectively 1 Hygiene of Transmissible Diseases, 1899, p. 338 DISINFECTION. used for each 1000 cubic feet of air-space to be disin-fected.^ Whenever formaldehyde is employed as a gas, all theapertures in the room should be carefully and tightlyclosed, since, having the same specifi
A manual of hygiene and sanitation . The Trenner-Lee formaldehyde generator. air-space was completely evaporated and the room keptclosed for three or four hours. ^ In the other apparatus one pound of formalin orformochloral, from 50 to 75 of Scherings paraform tab-lets, or a quart of methyl alcohol are to be respectively 1 Hygiene of Transmissible Diseases, 1899, p. 338 DISINFECTION. used for each 1000 cubic feet of air-space to be disin-fected.^ Whenever formaldehyde is employed as a gas, all theapertures in the room should be carefully and tightlyclosed, since, having the same specific gravity as the air,its diffusion takes place rapidly. Moreover, after a suffi-cient volume of the gas has been liberated, it should be Fig. The Kuhu formaldehyde generator. allowed to act as long as possible, preferably for twelvehours at least, and better for twenty-four, since, though itis more rapid, the time element is just as important afactor with this as with other disinfectants. Fliigge thinks 1 See also U. S. Quarantine Eegulations, as quoted on p. 355. STRENGTH OF DISINFECTANTS. 339 we obtain good results if 90 per cent, of the disease germspresent are killed by the formaldehyde fumigation. Lastly, the gas is an excellent deodorant, combining asit does with the effluvia from decomjwsing substances toproduce odorless compounds. Its odor, in turn, may bequickly dissipated from a room by evaporating a littleammonia therein. The following table of Koch and Jaeger is added toshow the comparative disinfectant strength of some sub-stances occasionally used for the purpose : DisinfectantBichloride of mercury Silver nitrate . Acid, hydrochloric Acid, sulphuric . Ferrum chlorate .Calcium chloride .Potass, permanganate
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