LOCAL NON-CONTAGIOUS DISEASES. 313 



running parallel one with the other. This laminal tissue covers 

 the digits in the same fashion as a sock does tlie foot, the horny 

 covering outside of everything being similar to the boot. The 

 outer surfaces of the claws are convex, while the inner surfaces 

 are slightly concave, which permits them to come in contact one 

 with the other only at their extremities. Situated between the 

 pasterns we find a gland known as the interungulate gland, its 

 opening being protected by a few long projecting hairs. This 

 gland secretes a yellow viscid fluid, intended to lubricate and pre- 

 vent friction in the cleft of the foot, and were it not present the 

 continual movements of the claws and their constant contact with 

 grit and other foreign matter would set up a chronic state of in- 



Ziitcrungulatc Sinus of Sbecp. 



«— Inner aspect of first phalanx. *— Hoot or claw. <r— Interungulate gland. 

 (!f— Orifice of its duct. 



, flammation. This canal at times becomes diseased. Inflamma- 

 tion and disorganization of the structures of the hoof then de- 

 velops, which if permitted to exist will eventually terminate in a 

 condition simulating foot-rot. The hoof-horn is secreted from 

 the coronary band, situated at the juncture of the skin and hoof. 

 This structure is very vascular, and anything which would inter- 

 fere with its normal functions would necessarily affect the secre- 

 tion of the hoof-horn, either to decrease such secretion or through 



