312 Agricultural Chemistry. 



acid," bodies related to carbolic acid. Therefore the "cresylic 

 acid" content of the crude material should be known and from 

 this a 2 per cent solution of the constituent made. The undis- 

 solved cresols that are present necessitate a thorough mixing 

 while spraying in order to facilitate an even distribution of the 

 material 



Cresol (trikresol) is supplied to the trade from the coal tar 

 industry in varying degrees of purity. It contains bodies of 

 the same general composition, but which are superior to car- 

 bolic acid as disinfectants. Grades containing less than 90 per 

 cent of "cresylic acid" (cresols) are undesirable because of the 

 suppression of solubility of the cresols by the oils usually present 

 as impurities. A 2 per cent cresol solution is considered superior 

 to a 5 per cent solution of carbolic acid. 



Liquid carbolic acid is a mixture of cresols, usually 90 to 

 98 per cent pure, which should be bought on guaranteed content 

 of "cresylic acid." Compoutid solution of cresol is a mixture 

 of equal parts of cresol and linseed-oil-potash soap. It is ap- 

 plied like cresol with the added advantage of greater solubility 

 in water. 



These coal tar compounds are the basis also of a number of 

 commercial, soluble disinfectants and dips, such as creolin, lysol. 

 solveol, Car-Sul dip, carboleum, cresol, disinfectall, germol, and 

 zenoleum. Fly removers, applied to animals for protection 

 against flies, have been prepared from these substances. Light 

 coal tar oil for this purpose has given the most satisfaction as 

 to persistence and freedom from gumming on the animal's coat. 



Creosote preparations for antiseptic treatment of timbers 

 against bacteria and fungi are the heavier fractions of coal tar 

 oil and carry carbolic acid, the cresols, naphthalene, (also used 

 in moth balls) , anthracene, and similar high-boiling hydrocarbons 

 and carbolic-acid-like bodies. 



Deodorants include some of the above materials, such as 

 chloride of lime, which destroy the causal substance through 

 chemical action. Other substances merely cover up the offensive 



