Frequently associated with internal canker is 

 external canker, an ulcerous sore forming on tlie 

 edge of the ear, caused by constant shaking of 

 the head, which gradually eats into the leather 

 (or flap of the ear). 



External canker may originate from the ears 

 being torn or scratched with briars, and will then 

 exist independent of internal canker, but when 

 the former is observed the latter should always 

 be suspected and the ears thoroughly examined 

 to ascertain if there be any internal trouble. 



Causes. — Exposure to cold, being a great deal 

 in the water, injuries due to a blow or kick, 

 neglecting to keep the ears clean are all assigned 

 as causes productive of internal canker. They 

 may help towards its development, but I believe 

 the origin of the trouble is an inflammatory con- 

 dition of the blood, which exhibits itself in the 

 form of internal canker on slight provocation. 

 The fact of its frequently being associated with 

 skin diseases is further evidence of its origin in 

 the blood. Too much flesh or corn meal feeding 

 will produce an inflammatory condition of the 

 blood. Let me here say that for years I have 

 been opposed to the use of corn meal, it being so 

 heating in its character. Any other cereal is pre- 

 ferable. A coarse grade of wheat flour or rice is 

 particularly nice, A vitiated condition of the 

 blood, rendered so by some debilitating affection, 

 will cause a pustulous eruption of the skin and 

 internal canker. 



