Common Ailments. 123 



when it should be washed off with strong 

 soap suds. 



When treating mange, it must be borne 

 in mind that the parasite burrows beneath 

 the outer surface of the skin, and obtains 

 its food and deposits its eggs in the soft 

 tissues that constitute the inner portion of 

 the skin. It is therefore often the case 

 that outside apphcations are unreHable, 

 owing to the fact that the ointment or wash 

 does not come into actual contact with its 

 intended victim ; and it often occurs, in 

 cases that are to all appearances completely 

 cured, that one or more of the parasites 

 has not been exterminated, and in a few 

 days, or perhaps weeks, the trouble again 

 appears. 



It is therefore of the greatest impor- 

 tance, when combating this trouble, that we 

 should not trust too much to appearances, 

 but persevere with unwearied patience in 

 our course of treatment until the result is 

 beyond doubt. 



