166 



SCIENTIFIC HORSESHOEING. 



the wall and wiugs and 

 cartilasres of the coffin- 

 bone and on its upper 

 face by the lower pas- 

 tern bone, and beneath, 

 where lies the greatest 

 possibility of accident, 

 it is guarded by the 

 flexor perforans, the 

 "A LiiLT^^^ A plantar cushion and 



Fig. 61. hoop, showing the external char- horny frog. (See Fig. 



ACTER OF NAVICULAR DISEASE. r -i i , ■, , 



5, and read the anatomy 



A, A, Base or ground line over the center of ^^^^le parts mentioned.) 

 the quarters. B, B, Upper edge of the coronet. 



C, C, Falling in of the hoof opposite the seat In this disease the 



of disease. The white line across the hoof indi- £g-(j^or perforans be- 

 cates the superfluous growth of the hoof, and 



the extent to which it should be reduced. comes ulcerated where 



it slides over the under 

 face of the navicular bone (at times involving the sesamoid 

 sheath in the process), and the severe pain experienced is from. 

 its play over the rough, diseased portion of that bone. This 

 disease is sometimes inherited, but once contracted, is incurable ; 

 a great deal may be done, however, to ease the animal. Two- 

 thirds of the cases of this malady, I believe, 

 are caused by improperly dressing the foot, 

 cutting the frog away, weakened the bars, 

 and thinning the sole ; and then driving Fig. 62. diseased na- 

 over uneven roads, provoking inflammation "^'^cular bone, taken 



FROM THE HOOF (FiG. 



in the tissues and membranes of the foot, g^) one-half size. 

 which finally communicates itself to the a, Diseased portion 

 bones and their attachments with one an- ^^ bone. 

 other. 



The above (Fig. 61) represents the back view of a hoof 

 showing the efiects of navicular disease by the shrinkage of the 

 outer wall upon the living parts of the foot, immediately below 



I 



