PEICKS IN SHOEING. 217 



The colour of the pus (mattei") found m the |iuncture iii:iy lie 

 black, yellow, yellowish-red. or purple. Tho lilack colour indicntes 

 that the wound is only superficial, in which case, when vent has 

 been given to the matter, the pain resulting from tlie com|iression 

 on the sensitive parts, will disappear : and recoverv mav sonu lie 

 expected. The yellow, or yellowish-red colour points to a niort' 



Fig. 72. — Horizontal section through. near fore hoof ; showing that the 

 wall is narrower on 'the. inside than on the outside of the hoof. 



serious injury. But if the discharge is of a purpile colour and 

 putrid smell, death of some of the soft parts and of a portion of 

 the pedal bone has commenced, and there is probably, also, 

 fracture of the pedal bone. The presence of a portion of dead 

 bone in the part may be known from the grating feel on probing 

 and the fact of the discharge tingeing a silver probe black, by the 

 formation of sulphide of silver. The surmise as to the existence of 

 some very serious injury within the foot, will be placed beyond all 



