152 INSECTS OF ECONOMIC IMPORTANCE 



plication to horses and cattle to protect them from 

 the attacks of flies. No one of these repellants has 

 proved entirely satisfactory because of the trouble 

 of application, the transitory effectiveness of the 

 material, and the possibility of injury to the animal 

 to which the mixture has been applied. 



The following mixtures are simple compounds 

 and perhaps as effective as any in present use : 



^^ Fish oil / 100 parts 



Oil of tar 50 parts 



Crude carbolic acid i part 



Apply with hand spray pump or with a brush. 



^* Fish oil I gallon 



Oil of tar 2 ounces 



Oil of pennyroyal 2 ounces 



Kerosene ^ pint 



Apply lightly with a brush. 



^^ Crude cotton-seed oil. ./. . ., 2 parts 



Pine tar i part 



Apply at milking time with a brush. 



Moore — South Dakota Bull. 81, pp. 41-42. 

 lishop — U. S. Dept. Agr., Ear's' Bull. 540. 



1= Weed— Miss. Expt. Stat., Bull. 28. 



