REPELLENTS FOR PROTECTING ANIMALS FROM FLIES. 21 



the hair to become sticky and dirty in places. There was also a loss 

 of hair. These unfavorable results were not noted in the second 

 test, in which a light application of oil was made with a brush. 



LAUREL OIL. 



June 19, 1913, a calf was rubbed with laurel oil. The protection 

 was very marked. 



July 2, 1913, the oil was applied to a calf with a paint brush. 

 There was a very marked repellent influence on both the hornflies 

 and the stable flies. An hour or so later the repellent action was 

 only very slightly reduced. 



July 3, 1913, the same calf was treated. Used about 2 ounces. 

 The mixture was applied with a paint brush. The repellent action 

 was marked. 



July 10, 1913, applied the oil with a brush to all parts of the body 

 except the head. Used 5 ounces. July 11, about 22 hours later, 

 there was an abundance of oil present on body and neck. There 

 were no flies on the body and neck. Some stable flies were present 

 on the legs. 



July 15, 1913, a severe exfoliation was noted on the shoulders and 

 neck. There was a slight exfoliation on the head. A similar ex- 

 foliation was noted on the withers shortly after the first treatment 

 on June 19. 



August 19, 1913, a calf was treated all over with laurel oil. Appli- 

 cation was made by means of a brush. 



August 20, there was an abundance of oil present. It was rubbed 

 off the abdomen. The repellent action was marked, but the odor of 

 the oil was not as strong as at first. 



August 21, some oil was present on the back and sides. There was 

 a repellent action still evident. 



August 7, 1913, a cow was treated with 10 per cent laurel oil in 

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

 lent action was marked. 



August 8, oil was present on the neck, shoulders, and back. It was 

 rubbed off the sides and abdomen. There was no odor of laurel oil. 

 Stable flies were present on the legs. Hornflies were present on the 

 abdomen where the oil had been rubbed off. 



Laurel oil has a very marked repellent action on both hornflies and 

 stable flies. No observations were made to determine the limit of the 

 duration of the repellent action, but it undoubtedly as a rule con- 

 tinues for several days. On account of the fact that the oil has a 

 tendency to produce an exfoliation of the skin it should be applied 

 very lightly to the hair. As indicated by the last test, in a 10 per 

 cent mixture of laurel oil and cottonseed oil the laurel oil disappears 

 by evaporation in less than 24 hours. 



