DISEASES or THE FETFOCK. ANKl.E, AND KOOT. 425 



i'<iioiiurv i)iuul Miul escapes from nii (ipt'ning lirtwcfii t\\v Imiul :m<l 

 lu)of. ;in ()poniii<j: must lit* minle on the sole, ami cohl hatlis mjidc 

 astringent with u litth* sulphate of ii-on oi- copper are to he used i'oi a 

 day or two. ^^'hen tho iliseharge becojnes healthy, the fistulous tracts 

 may Im' injecteil daily with a weak solution of hichlorid id uumcmh v, 

 nitrate of silvei, t'tc, and the f<iot ihes>ed as after operation for moist 

 corns. AAHien complieations arise, tlie tieatmeiit inu>t he varied to 

 meet the indications: if «j;an<;rene of tiie lateial cartilage takes place 

 it must he ticateil as directed undei- the head of caitilaginous (|uittoi-; 

 if tlie velvety tissue is gangrenous, it must be cut away; if the collin 

 bone is necrosed, it must iie scra|)ed. and tlu' resulting wounds tieated 

 on general principU's. After any of the operations fur corns have 

 been perf«)rmed. in which the soft tissues have been laid bare, it is 

 l>est to protect the foot l>y a sole of soft leather set beneatii 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 oi* usefulne.ss of 

 the patient. It is the wi<le. flat foot with low heels and thin wall 

 which is most liable to resist all etVorts toward ed'ccting a ('(implete 

 cure. 



BRUISE OF THK FROG. 



When the frog is severely brui.'^ed the injury is followed by sup))U- 

 ration beneath the horn, ami at times b\ partial gangrene of the 

 plantiir cu.shion. 



('aus(.s. — A IjiMii.so of the frog generally hapi)en.-N from stei)ping on 

 ft rough stone or other hard object. It is more liable to take phu^e 

 when trotting, running, or jumping than when at a slower pace. A 

 stone wedged in the shoe and piessing on the frog (U* between the 

 sides of the frog and the shoe, if it remains for a time, produces the 

 ssime results. A cut through the horny frog with some sharp in.stiu- 

 ment or a punctured wound by a blunt-])ointed instrument may also 

 cause suppuration and gangrene of the plantar cushion. liroad. flat 

 feet with low heels and a fleshy fiog arc most liable to these in- 

 juries. 



SymptomJi. — Lsimene.ss, severe in })roportion to the extent of the 

 bruise and the conse<juent suppuration, is always an early .symptom. 

 When the animal mo\<*.s, the toe only is |)laced to the ground or the 

 foot is carried and the patient hobbles along on thre<' legs. When 

 he is at rest, the foot is set forward with the toe on the ground and 

 the leg fle.xed at the feth»ck joint. .Vs .soon as the pus finds its way 

 to the surface the hnneness improves. If the frog is examined early 

 the injured spot may usually be found; later, if no oi)ening exi.sts, 

 the pus may be di.^'overed working its way toward the heels. The 

 horn is l(X)sene<l from the deeper tissues, and, if pared through, a 

 thin, yellow, watery and offensive i)us escapes. In other ca.^i's a 



