BLOOD SPAVIN, ETC. 305 



hock§, though they are not always attended with any seriou3 

 disadvantages. There is a predisposition to weakness, which 

 renders them suspicious. 



If the curb arises from recent injury, a little blood may with 

 advantage be taken from the sephena vein running up the inside 

 of the thigh ; cold water applications should be kept upon the 

 parts ; cloths wet with tincture of arnica, half a pint to a gallon 

 of water, are very useful ; or, the following ointment will be 

 found of service : dry iodine, one drachm ; iodide of potassa, 

 one drachm ; lard, one ounce j mix well together, and use once 

 a day. 



STRING HALT. 



This disease has never been very satisfactorily accounted for 

 by veterinary authors. It consists in a sudden, spasmodic 

 raising of the hind limbs, though it is said to have occurred in 

 the fore legs. The author has found, upon an examination after 

 death of the hock-joint of several animals affected with this 

 disease, that a little roughness from exostosis existed on the 

 OS calciSf or bone forming the cap of the hock, where the 

 perforans tendon plays over ; in other cases the tendon has been 

 found almost entirely surrounded with a bony case, which inter- 

 fered very materially with its action. He is inclined, therefore, 

 to regard these as the general causes of the disease. 



No treatment as yet practised has proved successful ; though 

 there are recorded isolated cases of spontaneous cure. 



BLOOD SPAVIN, BOG SPAVIN, AND THOROUGHPIN. 



These constitute one disease, occasioned by an over secretion 

 of joint oil in the hock joint, which causes a distention of the 

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