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bone and the tendon, and then attacks the tendon itself. At length, as the- 
disease progresses, these structures become welded together, and weakened. 
by the products of inflammatory action. 
The accompanying picture is engraved from a photograph of the lower surface of a 
diseased navicular bone, one-eighth enlarged. It shows the caries of the bone. 
The picture below (Sewell) represents a section of the horse’s foot,. 
showing (A) the navicular bone, (B) the flexor tendon, and (C) the coffin 
_ bone. It will be noticed that the navicular bone forms a kind of. pulley, 
round which the tendon works. We shall have occasion to refer to this 
picture again, as showing the method of treating navicular disease by the 
operation of frog-setoning. 
—< 
WKS 
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