Practical preventive medicine . boiled before washing. Foodremnants should be incinerated. 8. Employment of Fumigants.—These are most commonlyemployed in connection with terminal disinfection. Variousproprietary generators are on the market for the liberation of DISINFECTANTS AND DISINFECTION 99 both formaldehyd and sulphur dioxid, but the only advantagethat may be credited them is that of convenience. Most ofthese proprietary formaldehyd generators liberate the gasfrom paraformaldehyd or paraform, the solid polymer offormaldehyd. (a) Formaldehyd is the most satisfactory fumigant
Practical preventive medicine . boiled before washing. Foodremnants should be incinerated. 8. Employment of Fumigants.—These are most commonlyemployed in connection with terminal disinfection. Variousproprietary generators are on the market for the liberation of DISINFECTANTS AND DISINFECTION 99 both formaldehyd and sulphur dioxid, but the only advantagethat may be credited them is that of convenience. Most ofthese proprietary formaldehyd generators liberate the gasfrom paraformaldehyd or paraform, the solid polymer offormaldehyd. (a) Formaldehyd is the most satisfactory fumigant results depend upon the rapid liberation of the gasfrom either formalin, (its 40 per cent, aqueous solution) orsolid paraformaldehyd. It accomplishes a surface disinfec-tion and kills spores, though its action on them is slow and uncer-tain. It does not tarnish or corrode metal or bleach is not an insecticide. For successful results proper condi-tions of heat and moisture are necessary. The quarters to be. Fig. 7.—Flaring top tin bucket for generating formaldehyd by the perman-ganate method. Height 15 inches, diameter 10 inches at base, 15 inches attop of flare. (From Register Fever Nursing.) disinfected must be maintained at a temperature of 65 degreesF. or higher and the relative humidity must be 60 per cent, orhigher. The following methods may be used for its liberation:1. Spray the formalin upon moistened sheets spread out overstretched lines. Use at least eight ounces of formalin forevery 1000 cubic feet in the apartment. One ordinary bedsheet, when previously moistened, will retain this amount ofthe formalin: The gas is liberated by the evaporation of thewater. This is the simplest and cheapest method available. IOO PRACTICAL PREVENTIVE MEDICINE 2. The liberation of formaldehyd by means of potassiumpermanganate. (a) This method was widely employed when potassium saltswere cheap. A deep flaring can, or a large crock or jar is putin a tub in the apar
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