REPELLENTS FOR PROTECTING ANIMALS FROM FLIES. 17 



August 7, 1913, a calf was treated with 10 per cent oil of tar in 

 Beaumont oil. The mixture was applied with a brush. The repel- 

 lent action was marked. 



August 8, no odor of tar was noticeable. The oil was rubbed off the 

 abdomen, the sides, and outside of the thighs. Some stable flies were 

 present on the legs. Only a very few hornfiies were present. 



FIFTY PEE CENT OIL OF TAR IN BEAUMONT OIL. 



August 19, 1913, a cow was treated with a mixture of 50 per cent 

 oil of tar in Beaumont oil. The mixture was applied with a brush. 

 There was a slight salivation, and the cow remained rather quiet fol- 

 lowing the treatment. It seems certain that there were symptoms 

 of phenol poisoning. 



August 20, the odor of the oil of tar was still present. Only a few 

 stable flies were present on the legs. Other animals in the same pen 

 were covered with flies. The mixture had disappeared from the 

 sides and abdomen. 



August 21, the cow was a little stiff. Oil was still present on the 

 back. The cow Avas protected very little from the flies. 



SUMMARY OF RESULTS WITH OIL OF TAR. 



In the first test with 10 per cent oil of tar in cottonseed oil the 

 mixture was applied with a spray pump. About 2 quarts of the 

 liquid Avere applied. The repellent action lasted less than three 

 days. 



In the second test the mixture was applied by means of a brush, 

 and 3f ounces were used. The repellent action, which was very 

 marked at first, had nearly disappeared at the end of 18 hours. 



In the third test a half-and-half mixture of oil of tar and cotton- 

 seed oil was applied with a spray pump. About two quarts of the 

 mixture were used. There were symptoms of poisoning. The next 

 observation was made four days later, at which time there was no 

 repellent action. 



In the fourth test 10 per cent oil of tar in Beaumont oil was 

 applied with a spray pump. About 2 quarts of the mixture were 

 used. There were no symptoms of poisoning. 



In the fifth test 10 per cent oil of tar in Beaumont oil was applied 

 with a brush. On the following day the odor of tar had entirely dis- 

 appeared and the repellent action had almost entirely ceased. 



In the last test 50 per cent oil of tar in Beaumont oil was applied 

 with a brush. The protection lasted about two days. There were 

 mild symptoms of poisoning and the animal became slightly stiff. 



The repellent action of 10 and 50 per cent of oil of tar in cotton- 

 seed oil or in Beaumont oil is very marked, but when applied in 



