14 



PINE TAR. 



TEN PER CENT PINE TAR IN COTTONSEED OIL. 



July 29, 1912, sprayed a cow with 10 per cent of pine tar in cotton- 

 seed oil. Used 3 J quarts of the mixture. 



July 30, the cow was looking droopy. The ears were hanging. 



July 31, the hair was still oily. There was no odor of tar. The 

 animal was bright and perfectly normal. No hornflies were observed. 

 A few stable flies were present on the legs and body. The animal 

 was not fighting the flies, whereas unsprayed animals were con- 

 stantly switching their tails. 



August 1, some oil was still present. Some stable flies were pres- 

 ent, especially on the legs. Animal does not fight flies as much as 

 do the untreated animals. 



August 3, oil still present on the back, croup, and thighs. It is 

 very sticky. There is little or no protective action. 



TWENTY PER CENT PINE TAR IN COTTONSEED OIL. 



July 15, 1913, treated a cow with 20 per cent pine tar in cotton- 

 seed oil. Used 5^ ounces of mixture. It was applied with a brush. 

 The protection was marked but not quite so effective as either 10 per 

 cent crude carbolic acid or 10 per cent oil of tar in cottonseed oil. 

 July 16, about 18 hours later, the cow fought flies as much as did 

 the controls. There was some oil present on the neck, back, and on 

 the fore legs. There was no odor of tar. There was little or no pro- 

 tective action evident at this time. 



A HALF-AND-HALF MIXTURE OF PINE TAR AND COTTONSEED OIL. 



July 31, 1912, sprayed a calf with a half-and-half mixture of pine 

 tar and cottonseed oil. Used about 2 quarts of fluid. The mixture 

 was too thick to spray well in pump. The animal was sprayed very 

 unevenly and some spots were not covered. Two types of nozzles 

 were used, but a satisfactory spray was not developed. 



August 1, there was plenty of oil present and also an odor of tar. 

 Tar was visible here and there on the hair. No flies were observed. 



August 3, some oil was still present. There was a slight odor of 

 tar. A repellent action was still noticeable on the back, croup, and 

 thighs. 



July 31, a second calf was sprayed. Used about 2 quarts, which 

 was not enough to cover the animal properly. 



August 1, there was plenty of oil present, and there was a strong 

 odor of tar. No flies were observed. 



August 3, the oil and tar odor still present. A distinct repellent 

 action on stable flies was still noticeable. 



