TREATMENT OF MANGE AND SCABIES 127 



here the incline may lead to a dripping platform which may easily be 

 improvised for the purpose. This should be so constructed and appUed 

 that the drip will flow back into the vat. 



Plans for more elaborate dipping plants, suitable for large flocks, may 

 be obtained from bulletins issued by the Bureau of Animal Industry, 

 United States Department of Agriculture. 



To obtain the best results sheep should be sheared before dipping, 

 and the dip used at a temperature of 100° to 110° F. Keep each sheep 

 submerged two minutes by the watch, forcing the head, under at least 

 once just before the animal comes out. The dips should be freshly 



Fig. 73. — ^A small portable dipping vat for small flocks (from Bull. No. 21, 

 Bureau of An. Ind., Dept. of Agr.). 



prepared for each dipping; if permitted to stand for repeated treatment 

 failures and possibly injurious effects may result. 



Other Dips. — Tobacco dips, used either with or without sulphur, 

 are now much in use and give excellent results. Owing to the poisonous 

 character of nicotine, the active principle of tobacco upon which these 

 dips depend for their action, the exact nicotine content of the dip should 

 be known before it is used. This, according to the Bureau of Animal 

 Industry, should not exceed 0.07 of one per cent. Owing to the variation 

 of the percentage of nicotine in different kinds of tobacco and the added 

 reason that tobacco dips are somewhat tedious and disagreeable to 

 make, it is better to use a reliable tobacco extract, which m^y be ob- 

 tained upon the market, and exactly follow the instructions given for 

 the making of the dip. 



Tobacco dip is not injurious to the wool, therefore it has an advantage 

 for use upon sheep which may require treatment at a time when they 



