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Crude carbolic acid, one-half g;allon ; crude sulphuric acid, one-half 

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

 taken to protect the eyes and hands from accidental splashing. These 

 two substances should be mixed in tubs or glass vessels. The sul- 

 phuric acid is very slowly added to the carbolic acid. During the mixing 

 a large amount of heat is developed. The disinfecting power of the mixt- 

 ure is heightened if the amount of heat is kept down by placing the tub 

 or glass demijohn containing the acid in cold water while the sulphuric 

 acid is being added. The resulting mixture is added to the water in the 

 ratio of one .to twenty. One gallon of mixed acids will thus furnish 

 twenty gallons of a strongly disinfectant solution having a slightly 

 milky appearance. 



Creolin, lysol, disinfektol and other coal-tar products which 

 closely resemble carbolic acid in their composition and action may 

 be used for disinfection in place of the latter. While less caustic, 

 irritating and poisonous, and possibly slightly more active as 

 disinfectants, they are not so easily obtained as carbolic acid, 

 and are for practical purposes but little if any better. 



Corrosive sublimate (perchloride of mercury) is a very poisonous, 

 caustic and corrosive chemical, and must in all cases be used with 

 great caution, to avoid fatal results. It is the strongest disinfec- 

 tant for practical use that we have. As small a quantity as one 

 part to forty or fifty thousand parts of meat infusion will prevent 

 the growth of bacteria in it. Stronger solutions are used for dis- 

 infecting purposes, one part to one thousand parts of water or one 

 to five hundred parts of water being the strength of the mixture 

 Usually recommended. Approximately, sixty grains of sublimate 

 to a gallon of water or one ounce to eight gallons make a solution 

 of one to one thousand parts. It should always be mixed and 

 kept in glass jars or wooden tubs, as it quickly corrodes metals. 

 The mixture should be well stirred and allowed to stand for 

 several hours, in order that the sublimate may become thoroughly 

 dissolved. 



Never allow it to remain uncovered, where it is accessible to 

 man or animal. 



It may be applied with mop or brush, or better with spraying 

 apparatus, as advised for carbolic acid. When mixed with dirt, 

 especially manure, it loses its strength in proportion to the amount 

 of foreign substances present. For this reason all dirt should be 

 removed from the walls as thoroughly as possible by washing and 

 scraping before the sublimate is applied. Mangers, troughs, pails, 

 etc., that have been treated with sublimate, should be carefully 

 rinsed several times before being used again. 



