DISEASES OF THE FEET. 251 



This will hasten the inflammatory process, and as soon as the change in 

 the structure of the cartilage is complete, the lameness will cease. The 

 elasticity of the step will be lost, and the gait become stiff and unnatural. 

 Let the animal rest as much as possible until the inflammation has 

 entirely subsided. 



TREAD. 



Synonym.— Calking. 



Definition. — Tread is an injury of the coronet of the foot. 



Etiology. —Most common with heavy work horses, and usually occurs 

 in the hind feet, and during cold weather, when the horses are shod with 

 sharp heel calks. Generally inflicted by the shoe of the other foot in 

 turning, backing, or shying, and, very rarely, by a tramp from another 

 horse. 



Treatment. — If the bleeding is excessive, it may be stopped by band- 

 aging with a rag soaked in: 



Tincture of chloride of iron 3 i. 



Water | i. 



Afterward wash clean and treat as for over-reach. 



OVER-REACH. 



Etiology. — Over-reach is a wound of the heel of the fore-foot, 

 usually made by a blow struck by the inner edges of the toe of the hind 

 shoe. 



Treatment. — Eemove any jagged ends with a sharp knife, and apply 

 tincture of myrrh or tincture of arnica; keep dry, and generally the 

 wound will soon heel. If, however, the heel is badly bruised, after 

 paring the lower ends, bathe it three times a day with: 



Chloride of zinc gr. i. 



Water | i. 



As quittor is a possible sequence of an over-reach, it should never be 

 neglected. 



