374 BOARD OF AGRICULTURE. [Pub. Doc 



A solution of this strength is not caustic, but so irritating 

 that with most persons it will at first cause tingling and later 

 numbness of the hands or other parts of the body with which 

 it may come in contact for any length of time. A five per 

 cent watery solution may be used for the disinfection of walls, 

 floors, mangers, harnesses, excrement, offal, etc. For use 

 upon floors and walls it may be applied economically by 

 means of a pump ; preferably such a one as is employed for 

 spraying fruit trees. Thrown in a fine spray against the 

 walls, it penetrates into all the cracks and crevices. There 

 is little danger in using a five per cent solution about man- 

 gers or feed troughs if they are allowed to become thoroughly 

 dry before being used. 



Carbolic acid solutions are particularly effective for ridding 

 stables, pig pens and hen houses of lice and other parasites. 

 One part of acid and twenty or thirty parts linseed oil makes 

 an excellent mixture for application to the skin of animals 

 harboring lice or other animal or vegetable parasites. 



For disinfecting soils, manure heaps or bodies of animals, 

 stronger mixtures than five per cent solution may be used. 

 Crude acid is suitable for all disinfecting purposes of build- 

 ings, but only the better grades should be applied to the 

 bodies of living animals. 



To increase the efficiency of carbolic acid as a disinfectant, 

 some advise the use of sulphuric acid in combination with it. 

 The United States Department of Agriculture a few years 

 since recommended the use of the following mixture, and 

 gave these directions for its preparation and use : ■ — 



Crude carbolic acid, one-half gallon ; 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 sulphuric acid is very slowly added to the car- 

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

 oped. The disinfecting power of the mixture 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. 



