NAVICULAR DISEASE. 



207 



standing, when nutside. mi stone, or on metalled roads. These 

 facts suugest the advisability of providing, when practicable, a 

 bad conductor of heat, such as wood, for horses to stand on, instead 

 of stone, as, for instance, on cab-ranks. 



Althougii long-continued standing is very ajit to [iroduce lami- 

 nitis. it does not seem capable, of itself, to give rise to navicular 



I'ii,'- 67. --Caries ol" ihc na\icnlar l»ine 

 (na\"iculai disease). 



Fig. 68. — Lower surface uf pedal hone, I'ii;. 69. — Lower srirface of pedal b<jne, \s ilh 

 showing atlachment of perforans tendon, perforans tendon turned back, so as to 



which goes over the navicular bone. show caries of navicular bone. 



disease ; whether the animal stands on a bad conductor of heat, as 

 he usually does on board ship ; or on a good one, like wet soil, as 

 is often the case with farm horses. 



• ). Trotting. I am strongh' inclined to think that giving n. 

 horse his work — supposing it to be severe or ill-arranged, and the 

 ground hard — at the trot, predisposes him to navicular disease; 



