PSOROPTIC MANGE — SHEEP SCAB. 



631 



dipping vat and provided with a bung-hole about 4 inches from the 

 bottom, and allow ample time (two to three hours, or more if neces- 

 sary) to settle. 



When fully settled draw off the clear liquid into the dipping vat, and 

 add enough water to make a hundred gallons. Under no circumstances 

 should the sediment be used for dipping purposes. 



To summarise the position of the United States Department of 

 Agriculture on the lime-and-sulphur dips:— When properly made and 



Fig. 259. — A shorn sheep with large bare area due to scab. 



properly used these dijDS are second to none and equalled by few as scab 

 eradicators. There is always some injury to the wool resulting from the 

 use of these dips, but when properly made and properly used upon shorn 

 sheep, it is believed that this injury is so slight that it need not be con- 

 sidered ; on long wool the injury is greater and seems to vary with 

 different wools, being greater on a fine than on a coarse wool. This 

 injury consists chiefly in a change in the microscopic structure of the 

 fibre, caused by the caustic action of the ooze. When improperly made 

 and improperly used the lime and sulphur dips are both injurious and 

 dangerous, and in these cases the cheapness of the ingredients does not 



