Diseases of the Foot. 483 



pre-existing sores, and tends to produce fungous gi'owths 

 of the skin around the margin of the hoof and a degenera- 

 tion of horn in some respects comparable to canlcer. It is 

 mainly to be recognized by its spread in a flock as a 

 si^quenco of contact with diseased animals, and without 

 any sufficient cause in their management or in the damp- 

 ness of the locality. 



Treatment does not differ materially from that of simple 

 foot-rot except that a preference must be given to antisep- 

 tics ia the selection of caustic dressings. Hydrochloric 

 acid reduced with thrice its bulk of water; chloride of 

 zinc 1 dr., water 1 pint ; carbolic acid ; butter of antimony, 

 may be cited as examiples. Much more important, how- 

 ever, is it to separate the sound from the diseased, and 

 from contaminated pastures and buildings, and to thor- 

 oughly cleanse and disinfect the latter before they are 

 again used for the shelter of flocks (see Disinfection). 



FOOT-EOT FEOM TUBEECIILOSIS. 



This is common in cattle and sheep, the disease com- 

 mencing in the digital bones, which are enlarged with 

 interstitial and surrounding deposit, leading to open sores, 

 open joints and complete destruction of the member (see 

 Tiibe^'culom). 



