Psoroptic Acariasis in Sheep. 189 



brittle or to irritate the tender skin. In place of naming the 

 various coal tar sheep dips, the composition of which is secret and 

 may, therefore, be altered at will by the manufacturer, it seems 

 better to give some of the more common chemical coal tar pro- 

 ducts and indicate the strength in which each may be used. 



The familiar creolin may be used in the ratio of i J^ pints to 50 

 gallons of water. Lysol, 2 quarts to 50 gallons. Beta-Naphthol, 

 2 quarts to 50 gallons hot water. Aseptol, 2 quarts to 50 gallons. 

 Monochloronaphthol , 2 quarts to 50 gallons. Cresyl, 2 quarts to 

 50 gallons. Tobacco or other agents may be added at will. 



Impure and complex products of coal tar, containing a variety 

 of different chemical compounds, and rendered soluble or capable 

 of being eraulsionized by the addition of soap and soda ash make 

 good and cheap sheep dips. Thus three pints each of oil of tar, 

 and of the heavy oils (dead oil) drawn from coal tar can be added 

 to 50 gallons of water as a dip. 



Prevention. As psoroptic scabies is one of the most infective 

 of diseases, causing the most extensive losses, and is, in its initial 

 stages, one of the most obscure, it becomes the more necessary to 

 place it under the most rigid sanitary rules. 



When the disease is found in a flock, the fact should be at 

 once reported, under a penalty for failure, and the flock quaran- 

 tined in a well fenced field or fold apart from all other sheep or 

 goats, and treated by one of the methods above described until all 

 trace of the disease has disappeared. The place where they are 

 kept and where they have been must be thoroughly cleaned and 

 kept clean, and any manure, litter, and left-over fodder, as well 

 as the place itself, freely sprinkled with a strong solution of some 

 acaricide. If placed where no animals can have access to them 

 mercuric chloride may be used, but otherwise sulphuric acid solu- 

 tion ; carbolic acid, 5 per cent.; creolin, 5 per cent.; tar water or 

 solution of chloride of lime, 4 per cent. The floor, walls, racks, 

 troughs, fences, rubbing posts, stones, and all woodwork should 

 be washed with scalding water or a solution of caustic potash and 

 then covered with a .solution of one of the acaricides. 



The dispo.sal to others of animals affected with scabies, or their 

 exposure in any unfenced or public place should be made and 

 dealt with as a misdemeanor. The disposal or exposure of un- 

 disinfected hides or wool taken from the affected should be for- 



