DISEASES OF THE FETLOCK, ANKLE, AND FOOT. 425 
coronary band and escapes from an opening between the band and 
hoof, an opening must be made on the sole, and cold baths made 
astringent with a little sulphate of iron or copper are to be used for a 
day or two. When the discharge becomes healthy, the fistulous tracts 
may be injected daily with a weak solution of bichlorid of mercury, 
nitrate of silver, etc., and the foot dressed as after operation for moist 
corns. When complications arise, the treatment must be varied ‘to 
meet the indications; if gangrene of the lateral cartilage takes place 
it must be treated as directed under the head of cartilaginous quittor ; 
if the velvety tissue is gangrenous, it must be cut away; if the coffin 
bone is necrosed, it must be scraped, and the resulting wounds treated 
on general principles. After any of the operations for corns have 
been performed, in which the soft tissues have been laid bare, it is 
best to protect the foot by a sole of soft leather set beneath the shoe 
when the animal is returned to work. Only in rare instances are the 
complications of corns so serious as to destroy the life or usefulness of 
the patient. It is the wide, flat foot with low heels and thin wall 
which is most liable to resist all efforts toward effecting a complete 
cure. 
BRUISE OF THE FROG. 
When the frog is severely bruised the injury is followed by suppu- 
ration beneath the horn, and at times by partial gangrene of the 
plantar cushion. 
Causes.—A bruise of the frog generally happens from stepping on 
a rough stone or other hard object. It is more liable to take place 
when trotting, running, or jumping than when at a slower pace. A 
stone wedged in the shoe and pressing on the frog or between the 
sides of the frog and the shoe, if it remains for a time, produces the 
same results. A cut through the horny frog with some sharp instru- 
ment or a punctured wound by a blunt-pointed instrument may also 
cause suppuration and gangrene of the plantar cushion. Broad, flat 
feet with low heels and a fleshy frog are most liable to these in- 
juries. : 
Symptoms.—Lameness, severe in proportion to the extent of the 
bruise and the consequent suppuration, is always an early symptom. 
When the animal moves, the toe only is placed to the ground or the 
foot is carried and the patient hobbles along on three legs. When 
he is at rest, the foot is set forward with the toe on the ground and 
the leg flexed at the fetlock joint. As soon as the pus finds its way 
to the surface the lameness improves. If the frog is examined early 
the injured spot may usually be found; later, if no opening exists, 
the pus may be discovered working its way toward the heels. The 
horn is loosened from the deeper tissues, and, if pared through, a 
thin, yellow, watery and offensive pus escapes. In other cases a 
