40 BACTERIOLOGY FOR NURSES 



pouring formalin over permanganate of potassium 

 in an open vessel, which causes the liberation of an 

 immense volume of gas, is more commonly employed. 

 For each 1000 cubic feet of space at 15.5 C. (60 

 F.) use:- 



Formaldehyde, 40 per cent, 16 ounces, 

 Potassium permanganate, 6f ounces. 

 The vessel should allow not less than 12 quarts 

 for this amount. This process has the advantage of 

 being easily multiplied for large spaces, which is 

 not the case with single lamps or generators. 



The formaldehyde should not be added until the 

 last moment before leaving and sealing the room. 

 When it is impossible to leave a room open for 

 twenty-four hours after fumigation with formalde- 

 hyde, the odor may be quickly removed by placing 

 a shallow vessel (platter) filled with aqua ammonia 

 in the room. 



Disinfection of Infective Materials. 

 Excreta : Carbolic acid, 5 per cent ; 



or Chloride of lime, 2 per cent ; 

 or Milk of lime (lime and water, consist- 

 ency of cream) ; 



or Bichloride of mercury, 1 ounce, 

 Hydrochloric acid, 10 ounces, 

 Water, 1 gallon. 



