LOCAL NON-OONTAGIOUS BISEASES. 



311 



expressed themselves as satisfied with its contagiousness, but that 

 it is necessary when claiming a specific character for a disease to 

 be able to show incontrovertible proof that such is the case, and 



Figr. 1. 



Fig. 2. 



Tig. 3. 



FifT. 4. 



Fig-. 1. — 1. Shrivelled or decayed horn. 2. Dark spot indicating- a. cavity.. 

 3, Minute fissure. 



Fig. 2. — Early stag-e of foot-rot induced by rubbing matter on interdigital cuticle 

 at a. 



Fig. 3. — Advanced foot-rot. Hoof-horn overgrown to a degree highly abnormal; 

 undjr-surface broken and rotten at ^- From one digit the hoof-hora is nearly 

 detached, exposing inflamed foot at a. covered -with fibres of soft horn. 



(These three illustrations are from originals of Prof. Brown.) 



Fig. 4. — Section of foot through horn-fissure {a)» showing extension of the crack- 

 to the interior; (d) edge of hoof bent under, permitting collection of dirt. (Brown.) 



