292 NAVICULARTHRITIS. 



then a fly blister well rubbed in around the upper margin of the 

 hoof; afterward use the hoof ointment once a day, until the 

 coronet d)mes up full. 



NAVICULAKTHRITIS. 



Coffin-joint lameness, as it is generally termed, is a dis- 

 ease of very common occurrence, and often troublesome to 

 manage. This joint is formed by the union of three bones : 

 the OS pedis, or coffin-bone, situated immediately within 

 the hoof; the coronary, or small pastern bone, the lower 

 half of which is situated witliin the upper part of the hoof, 

 ^^=-., called the coronet, and uniting with the 

 OS pedis; and the navicular, situated be- 

 tween and behind 

 the two, uniting 

 with both, and 

 forming the navi- 

 cular joint. This 

 joint is protected 



THE FAMOUS TROTTING MARE, FLORA TEMPLE. againSt HljUry irOm 



concussion by the fatty frog, the sensible frog, and the horny 

 frog, situated beneath it, and forming a soft elastic cushion on 

 which it may rest. So long as the foot remains in a healthy 

 condition, there is little danger of the occurrence of this dis- 

 ease. Even though the foot be strained very considerably, 

 and a high degree of inflammatory action be produced, this 

 disease will hardly arise, unless the inflammation becomes 

 chronic. The author regards its origin as mainly due to a 

 contracted condition of the feet, which, in fact, is the predis- 

 posing cause. 



