PSOROPTIC MANGE — SHF.EP SCAB. 



625 



Does scab exist in the fiock? — If scab does not actually exist and 

 the wool is long, the dipping in this case simply being a matter of 

 precaution, it is best not to select a dip containing lime. 



71ie facilities at hand for preparing dip. — If fuel is very scarce, 

 so that it is impracticable to boil the mixture for at least two hours, 

 the lime-and -sulphur dips should not be selected. 



TJie pastures. — In case it is necessary to place the dipped sheep 

 on the same pastures they occupied before being dipped, it is always 



y-y- 



Fig. 256. — A comparatively early case of common scab, showing a bare spot _ 

 and tagging of the wool. 



best to use a dip containing sulphur. If a proprietary dip is selected 

 under those circumstances, it is suggested that sulphur be added, 

 about 1 lb. of flowers of sulphur to every 6 gallons of dip. The 

 object in using sulphur is to place in the wool a material which 

 will not evaporate quickly, but will remain there for a longer period 

 of time than the scab parasites ordinarily remain alive away from 

 their hosts. By doing this the sheep are protected against reinfection. 

 Sulphur is one of the oldest known remedies for scab ; its use 

 is best known in the tobacco-and-sulphur dip and in the lime-and- 

 sulphur dip. These home-made mixtures are the two dips which 

 D.c. s s 



