20 BULLETIN 131, U. S. DEPARTMENT OF AGRICULTURE. 



of camphor. Some hornflies were present and many stable flies were 

 on the legs. 



The immediate protection rendered by the above mixture is 

 marked, but its action lasts only for a few hours. 



HALF-AND-HALF MIXTURE OF KEROSENE AND COTTONSEED OIL. 



August 7, 1913, a cow was treated with a half-and-half mixture 

 of cottonseed oil and kerosene. The mixture was applied with a 

 brush. The flies were repelled. 



August 8, the oil was rubbed off the sides, abdomen, and the out- 

 side of the thighs. Very few flies were present. 



KEROSENE EMULSION. 



August 21, 1913, treated a cow with kerosene emulsion made ac- 

 cording to the formula on page 11, diluted 1 to 8. The emulsion had 

 only a very slight repellent action. 



BEAUMONT OIL. 



August 7, 1913, a calf was treated with Beaumont oil. The oil was 

 applied with a brush. The repellent action was marked. August 

 S, the oil had been rubbed off the abdomen, the sides, and the outside 

 of the thighs. Stable flies were present on the legs. There was 

 plenty of oil present on the neck, shoulders, and back. There were 

 no hornflies on the animal, although they had been numerous the 

 day before. 



FISH OIL. 



July 22, 1912, a calf was sprayed with fish oil. About 2 quarts of 

 the oil were used. July 23, the oil was present on the hair. Flies 

 frequently lit on the animal but left almost immediately. A few 

 stable flies were noted on the legs. No hornflies were observed. 



July 25, considerable oil was still present. Some flies were seen 

 to light on and crawl over the greasy hair. There was a very slight 

 fishy odor. 



July 29, oil was present on the back and rump. No hornflies were 

 observed. Stable flies were observed on the legs. 



August 6, rear portion of body very sticky and dirty. There was 

 a loss of hair in spots on the back and sides. 



July 15, 1913, applied fish oil with a brush. The protection was 

 very marked. July 16, about 20 hours later, there was an abundance 

 of oil present on the upper half of body, and a repellent action was 

 noticeable in this region. There was still a very slight amount of oil 

 on the legs, but it was not sufficient to keep the flies off. 



In the first test with fish oil the oil was applied by means of a 

 spray pump. Two liters were used. The repellent action lasted be- 

 tween one and three days. The liberal application of the oil caused 



