210 PRACTICAL DIRECTIONS FOR DISINFECTION. 



FOR MERCHANDISE AND THE MAILS. 



The disinfection of merchandise and of the mails will only be required 

 under exceptional circumstances ; free aeration will usually be sufficient. If 

 disinfection seems necessary, fumigation with sulphur dioxide will be the 

 only practicable method of accomplishing it without injury. 



RAGS. 



(a) Rags which have been usea for wiping away infectious discharges 

 should at once be burned. 



(b) Rags collected for the paper-makers during the prevalence of an epi- 

 demic should be disinfected, before they are compressed in bales, by 



1. Exposure to superheated steam of 105 C. (221 F.") for ten minutes. 



2. Immersion in boiling water for half an hour. 



SHIPS. 



(a) Infected ships at sea should be washed in every accessible place, and 

 especially the localities occupied by the sick, with 



1. Solution of mercuric chloride, 1 : 1,000. 



2. Solution of carbolic acid, two per cent. 



The bilge should be disinfected by the liberal use of a strong solution of 

 mercuric chloride. 



(b) Upon arrival at a quarantine station, an infected ship should at 

 once be fumigated with sulphurous acid gas, using three pounds of sulphur 

 for every thousand cubic feet of air space; the cargo should then be dis- 

 charged on lighters; a liberal supply of the concentrated solution of mercuric 

 chloride (four ounces to the gallon) should be thrown into the bilge, and at 

 the end of twenty- four hours the bilge watei should be pumped out and re- 

 placed with pure sea water; this should be repeated. A second fumigation, 

 after the removal of the cargo, is recommended; all accessible surfaces should 

 be washed with one of the disinfecting solutions heretofore recommended, 

 and subsequently with soap and hot water. 



FOR RAILWAY CARS. 



The directions given for the disinfection of dwellings, hospital wards, and 

 ships apply as well to infected railway cars. The treatment of excreta with 

 a disinfectant, before they are scattered along the tracks, seems desirable at 

 all times in view of the fact that they may contain infectious germs. Dur- 

 ing the prevalence of an epidemic of cholera this is imperative. For this 

 purpose the standard solution of chloride of lime is recommended. 



DISINFECTION BY STEAM. 



The Committee on Disinfectants, in tne above-quoted "Conclu- 

 sions," recommends the use of " steam under pressure, 105 C. (221 

 F.), for ten minutes" for the destruction of spore-containing infec- 

 tious material. The spores of all known pathogenic bacteria are d< '- 

 stroyed by a temperature of 100 C. maintained for five minutes, and 

 in view of this fact the temperature fixed by the committee is ample, 

 and to exact a higher temperature or longer exposure would be un- 

 n-asonahle. hut in practical disinfection the temperature required 

 to destroy infectious material is not the only question to be considered. 

 Economy in the construction and operation of the steam disinfecting 

 apparatus must have due attention, and an important point relates 



