CANKER. 283 



For treatment, wash the feet well with soap and water ; fill 

 the cleft with powdered sulphate of copper, and pack over it a 

 little tow ; remove the filth from the stall, and the animal soon 

 recovers. An ointment may also be used, made of equal parts 

 of pine-tar and lard, melted over a slow fire ; when cool, add 

 sulphuric acid until ebullition ceases, and it is then fit for r.sc. 



CANKEK. 



This arises from neglected thrush, often proving very difficult 

 to manage. It exte^nds from the horny frog to the sensitive frog, 

 and sometimes to the navicular joint, involving the surrounding 

 parts, and causing much alteration or destruction of the structures 

 affected. It is by no means always a local disease, but is influ- 

 enced by a morbid or unhealthy condition of the blood. The au- 

 thor's attention was once called to a case of four years' standing, 

 in which all the feet were involved, and the value of the animal 

 thereby so depreciated that he was sold to a shoeing-smith of 

 Philadelphia for the sum of twenty-five dollars, his cost being 

 some two hundred and fifty dollars. All treatment had failed 

 up to that time ; yet, notwithstanding the long resistance of 

 the disease, it gradually yielded to constitutional treatment. 



For treatment, all loose horn should be removed, that the 

 parts may be properly dressed. If taken early, the following 

 wash may be used with success ; of nitrate of silver, half au 

 ounce; water, one pint; shake well together, and use once a 

 day. Or, the ointment of tar, lard, and sulphuric acid, recom- 

 mended in cases of thrush, may be usefully applied. Should 

 this fail, apply once a day the following : of castor oil, one part ; 

 collodion, two parts ; mix well together. Give internally half 

 a drachm of powdered nux vomica mixed in the feed, which 



