ttUUHlES. 



189 



TREAD AND OVERREACH 



Are identical in nature. A tread is a contused wound 

 of the coronet of either the hind or fore foot, caused by 

 the opposite foot. An overreach is a tread on the coro- 

 net of the fore foot by the hind foot. The parts injured 

 consist of skin, cartilage, and horn. The injury is there- 

 fore complex and requires careful treatment. 



Fig;. 65. Tread. 



Fig. 67. Overreach. 



Remedy. — Eemove hair and such lacerated parts of 

 horn as may harbor dirt. Immerse in warm water. Hot 

 poultice, but discontinue when healing begins. Turpen- 

 tine or nitric acid lotion dressing. Physic. Heels of 

 shoes well ronnded off. Light shoes. Protect coronet 

 with pad. 



FROST BITE (GELATIO), 



If often repeated, causes the part to become perma- 

 nently weakened, slightly swelled, of a purple color, with 

 less heat, and afterward inflamed. The skin cracks, and a 

 discharge of sanguineous matter takes place. More intense 

 cold entirely suspends vital action, the part becoming 

 pale, insensible, and shriveled. The skin, especially the 

 heel, will often slough across from side to side, forming 

 a strip of dead skin, under which is a deep chasm, called 

 a cracked heel. 



Remedy. — Raise temperature of frozen parts gradually. 



