LAMENESS AND DISEASES, ETC. 



147 



Fig. 43. coffin-bone with supplemkntal at- 

 tachment OF SIDE BONE OR OSSIFIED LATERAL 

 CARTILAGE. 



A, Body of coffin-bone. B, Lower margin of 

 its wing. C, Side bone or ossified cartilage sur- 

 mounting the wing. 



its attacks, and in 

 some instances it is 

 hereditary. 



There are num- 

 bers of conditions 

 which may be the 

 exciting cause of this 

 bony formation ; va- 

 rious diseases of the 

 foot may occasionally 

 involve the connec- 

 tive tissues, such as 

 ulcered heels and 

 laminitis ; but con- 

 traction, violent concussion or injuries, and over distension by 

 weight, bad shoeing and unlevel feet are the prevailing causes 

 of ossific development. The present example is to be classed 

 with others resulting 

 from bad shoeing, 

 and is the outcome 

 of the next morbid 

 specimen, here intro- 

 duced as a dismal 

 relic of perverted 

 appliances. 



In this case, the 

 distorted condition 

 of the hoof — the 

 twisted heel and cor- 

 rugated coronet — the 

 diseased appearance 



of the laminae, and the disorganized character of the whole 



structure generally, are the consistent product of one common 



actor, namely, an uneven ground-bearing of the foot. To still 



Fia. 44. VIEW OP the hoop (op right front 



foot) in which the bone (fig. 40) WAS IMBEDDED 

 AS INDICATED, BY THE DISTORTION OF THE OUTSIDE 

 HEEL. 



