118 CANKER ON THE 



benefit derived from it is very apparent. When the cankered 

 dog is very fat, occasional bleeding- is also beneficial. 



External applications are likewise essential to the cure, and 

 in some mild cases are all that are necessary, particularly where 

 it may be supposed that svi^imming much, or too frequent 

 washing, may have principally tended to produce the com- 

 plaint. In the early stages a wash, composed of half a dram 

 of acetate (^sugar) of lead, dissolved in four ounces of rose or 

 rain water, is often all that is necessary. A small tea-spoon- 

 ful may be introduced (previously warmed to a blood heat, to 

 prevent surprise) night and morning, rubbing the root of the 

 ear at the same time, to promote the entrance of the wash 

 into the cavities. In more obstinate cases, it is prudent to 

 add fifteen or twenty grains of vitriolated zinc {white vitriol) 

 to the wash ; and if, instead of water, a decoction of oak 

 bark is made use of to form the wash, it will greatly promote 

 the end desired. In some cases, acetate of copper (^verdi- 

 gris), mixed with oil, has proved beneficial when introduced 

 in the same manner. In others, submuriate of quicksilver 

 (calomel) and oil have produced amendment in the same way. 

 A very weak injection of the oxymuriate of quicksilver (cor- 

 rosive sublimate) has succeeded when every other applica- 

 tion has failed. 



-*v^#^.*sr- 



\ 



Cmiker on the Outside of the Ear, 



Although this complaint bears the same name with the 

 former, in appearance it is very different. It consists of an 

 ill-disposed ulcer, which is usually situated on the lower edge 

 of the flap or pendulous part of one or both ears, dividing it 

 into a kind of slit. It seems to itch intolerably, and is 

 therefore kept in a continual state of aggravation by the 

 shaking of the dog's head. It is not a little remarkable, that 

 whereas long-haired dogs (as Newfoundlands , setters, and 

 water-spaniels) are more subject to internal canker of the 



