1903.] 



PUBLIC DOCUMENT — No. 33. 



61 



B. Tests of Fly Preventives. 

 For the past two years this division has made a trial of a 

 number of so-called fly removers. These materials are gen- 

 erally sold at retail for from one to one and one-half dollars 

 a gallon . No efix)rt was made to ascertain the exact compo- 

 sition of each. They appeared to consist largely of some 

 oil such as crude petroleum, to Avhich more or less pine tar 

 had been added. In one case fish oil was noticed, and in 

 another light coal tar oil. When not too thick, they were 

 applied with a "Woodason or Aspinwall sprayer ; otherwise, 

 a four-inch varnish brush, dipped in the liquid, was very 

 lightly drawn over the animals. The latter method is less 

 satisfactory, for the reason that it is hardly possible to avoid 

 putting on an excess ; in which case it forms a sticky mass 

 with the hair, to which the dust adheres, giving the animals 

 a very untidy appearance. 



Brands and Manufacturers. 



Results ivith Coivs. 



The cows were treated in the morning before being turned 

 out in the yard, and again at night before milking. They 

 were obsei-ved at frequent intervals during the day, in order 

 to note the effect of each particular brand. 



1. Sure Thing. — Applied as spray. Keeps off flies for 

 a short time, but not lasting in its eflects. 



