374 DISENFECTION 



at 50° C, although this has no particular disinfecting power. 

 If the cars are infected he sprays with a 5 to 10 per cent solu- 

 tion of formaldehyde. 



For disinfecting pens, stable floors and the like the follow- 

 ing solutions have been recommended and their careful and 

 intelligent use has shown them to be very efficacious. 



1. Cort'osivc sublimate {mejxui'ic chloride) , i ounce in 8 

 gallojis of zvater {one-tenth of i per cent). The water should be 

 put into wooden tubs or barrels and the powdered sublimate 

 added to it. The whole must be allowed to stand for twenty- 

 four hours, so as to give the sublimate an opportunity to be- 

 come entirely dissolved. Since this solution is poisonous, it 

 should be kept covered up and well guarded. It may be ap- 

 plied with a broom or mop and should be used freely on all 

 woodwork . Since it loses its virtue in proportion to the amount 

 of dirt present, all manure and other dirt should be first 

 removed before applying the disinfectant. The manure should 

 be covered with lime. 



2. Chlorinated lime. Five ounces of chloride of lime to a 

 gallon of water (4 per cent). This should be applied in the 

 same wa}' as the corrosive sublimate. 



3. A mixture of crude carbolic and sulphuric acids. The 

 following disinfectant has been found to be very serviceable. 

 It is not poisonous, but quite corrosive, and care should be 

 taken to protect the eyes and hands from accidental splashing : 



Gallon. 



Crude carbolic acid ^ 



Crude sulphuric acid .|< 



These two substances should be mixed in tubs or glass 

 vessels. The sulphuric acid is ver}- slowly added to the car- 

 bolic acid. During the mixing a large amount of heat is de- 

 A' eloped. The disinfecting power of the mixture is heightened 

 if the amount of heat is kept down b}' placing the tub or glass 

 demiiohn containing the carbolic acid in cold water while the 

 sulphuric acid is being added. The resulting mixture is 

 added to w^ater in the ratio of i to 20. One gallon of mixed 

 acids will thus furnish 20 gallons of a strong disinfecting solu- 

 tion, having a slightly milky appearance. 



