17 



be scraped and scrubbed. For this latter purpose a hot 

 solution of sal soda is usually of assistance. 

 Application and Selection of Disinfectants. — A 



spray pump is the most satisfactory and effective means 

 of applying disinfectants to large surfaces, such as walls, 

 ceilings, manure piles, hay stacks, straw stacks, etc. 



Care should be exercised in selecting suitable disinfec- 

 tants. A solution of formaldehyde is considered most 

 suitable for hay, straw, harness, blankets, feed bags, lap 

 robes, and finished surfaces of walls, ceilings, etc. 



Chlorid of lime is very satisfactory for outside disinfec- 

 tion work where there is plenty of air, as. for instance, 

 manure piles, open sheds, stock pens, ground, etc., but the 

 fumes are very irritating and deleterious to those who at- 

 tempt to spray with it in closed buildings. Interiors of 

 buildings may be sprayed with compound solution of cresol 

 (U. S. P.). crystal carbolic-acid solution, or some of the 

 other disinfectants prescribed by the regulations. When 

 desirable, a small quantity of unslaked lime may be added 

 to the solution in order to mark where the disinfectant has 

 been applied. 



Formaldehyde gas is suitable for disinfecting dwellings, 

 cellars, milk houses, granaries, and other tight buildings. 

 Clothing and other articles that can not be dipped or 

 sprayed may be hung in such buildings and fumigated. 

 Such articles as chains, halters, feed bags, harness, cloth 

 lap robes, etc., should be dipped in a compound cresol 

 solution. 



In fumigating buildings with formaldehyde gas, 20 

 ounces of formalin (40 per cent formaldehyde gas) to 16f 

 ounces of potassium permanganate are required to disin- 

 fect 1 .000 cubic feet of air space. A violent chemical reac- 

 tion takes place immediately when the formalin and per- 

 manganate are brought together. 



