10 BULLETIN" 131, U. S. DEPARTMENT OF AGRICULTURE. 



Place the resin, soap shavings, the one-half part of water, and fish 

 oil together in a receptacle and boil until the resin is dissolved. 

 Then add the 3 parts of water, following with the oil of tar mixed 

 with the kerosene. Stir the mixture well and allow it to boil for 

 15 minutes. When cool the mixture is ready for use and should be 

 stirred frequently while being applied. Application should be made 

 with a brush. One-eighth to half a pint is required for each animal. 

 The cost of the mixture is given as 30 cents a gallon. 



The present writer has not made or used the above repellent. Its 

 formula and method of preparation seem too complex for wide 

 use. It would appear that great caution should be exercised in boil- 

 ing the mixture because of the inflammability of some of the in- 

 gredients. 



The same author recommends the following formula for horses. 

 It is said to be eif ective for three to four hours and even longer : 



Fish oil 2 quarts. 



Carbolic acid (crude) 1 pint. 



Pennyroyal 1 ounce. 



Oil of tar 8 ounces. 



Kerosene 1 1J quarts. 



The cost is given at about 80 cents a gallon. The mixture must be 

 applied with an atomizer and not with a brush. 



Carlyle (1899), of the Wisconsin Experiment Station, states that 

 fish oil to which is added a little oil of tar and a little sulphur will 

 serve to protect cows from hornflies for four to five days if the 

 weather is fine. He states that none of the remedies seem to be 

 effective against the stable fly an hour after being applied. 



Otis (1901) recommends a repellent worked out by the entomologi- 

 cal department of the Kansas station. The formula is as follows : 



Resin_ 1| pourds. 



Laundry soap 2 cakes. 



Fish oil £ pint. 



Water enough to make__^ 3 gallons. 



Dissolve the resin in a solution of soap and water by heating. 

 Add the fish oil and the rest of the water. Apply with a brush. If 

 to be used as a spray, add one-half pint of kerosene. The cost is 7 to 

 8 cents a gallon. 



Fish oil containing a small admixture of carbolic acid has been 

 used with good success as a repellent. 



Lindsey (1903), at the Massachusetts Agricultural Experiment 

 Station, found light coal-tar oil quite satisfactory. This oil is de- 

 scribed as the lighter of two oils derived from tar. It is a dark, 

 thin oil with a strong creosote odor. It was applied as a spray. 



1 Or enough to make 1 gallon of mixture. 



