188 Veterinary Medicine. 



carbolic acid which, as seen from our table, is a potent acaricide. 

 The drawbacks are various : it reddens and shrivels the wool ; it 

 is volatile and readily absorbed so that it gives no permanent pro- 

 tection and in a few days a new stock of acari may be taken from 

 lairs and rubbing places ; it is very soluble and easily washed off 

 by rains or carried in sweat. 



Tobacco Dips. Of non-mineral baths tobacco is certainly one 

 of the best. Tobacco is a slow acaricide but it is non-volatile and 

 remains for a length of time on the wool and skin, protecting the 

 sheep against any fresh arrivals of the psoroptes. The sheep is 

 very insusceptible to nausea, and unless the application to the 

 skin is very strong, or unless a considerable amount is swallowed 

 there is practically no danger of poisoning. Finally, tobacco does 

 not deteriorate but tends rather to improve the wool. The 

 tobacco may be used in the proportion of i or even 2 parts to 20 : 

 (5 or 10 lbs. to 100 gallons water). It may be steeped for 24 

 hours, and then brought to the boiling point, cooled to 80° F, 

 strained and used. It must of course be well worked into the 

 skin, with the breaking up of the scabs, and in inveterate cases 

 may require to be repeated once 01 twice at intervals of ten days. 



Tobacco and Sulphur Dips. This combination is one of the 

 most effective dips known, yet one of the safest. Ten pounds 

 each of tobacco and sulphur are added to 60 gallons of water. 

 The tobacco is steeped for 24 hours in water, then raised to the 

 boiling point, then allowed to cool for twelve hours. It may now 

 be strained and pressed, the liquor mixed with the sulphur made 

 into a gruel-like mixture by rubbing up in water, diluted with 

 water to make the required amount, and thoroughly mixed by 

 stirring. In Australia hundreds of thousands of scabby sheep, 

 many of two years standing, have been cured in two dressings 

 without the destruction of any fences or other objects used for 

 rubbing. It improves rather than deteriorates the wool and does 

 not affect the health even temporarily. 



Coal Tar Dips. A number of dips can be made from the coal 

 tar products, preference being given to the heavier oils which 

 volatilize less readily and are therefore more permanent in their 

 effects. Nearly all of them are rendered soluble in water by a 

 large admixture of alkalies and alkaline salts and are, therefore, 

 easily washed off, besides tending more or less to render the wool 



