DISEASES OF THE LATERAL CARTILAGES 361 
only of the cartilage, and do so in what appears at first 
sight a comparatively rough-and-ready manner. 
The apparent roughness is that they do not concern 
themselves with conserving the coronary cushion, and 
hesitate but little in cutting portions of it bodily away. 
One would imagine that in this case the quarter of the side 
operated on would be always more or less bare of horn. 
Such, however, is not the case. 
To perform this operation the animal is again cast and 
chloroformed. Some operators, however, use the stocks 
and dispense with the anexsthetic. The foot is first well 
cleaned with soap and water and a stiff brush, and the hair 
of the coronet over the seat of operation shaved. Again, 
too, the horn of the affected quarter is rasped until it yields 
easily to pressure of the thumb, and the whole of the foot 
washed in an antiseptic solution. 
A probe is now inserted into the opening at the coronet, 
and the direction of the fistula noted, after which the foot 
is firmly secured, and an Esmarch bandage and tourniquet 
applied to the limb. 
This done, a triangular or wedge-shaped portion of skin, 
coronary cushion, and thinned horn is removed with a 
strong sage-knife or scalpel. 
The base of the wedge-shaped portion removed contains 
the opening of the fistula, and the apex of the wedge should 
reach to the bottom of the sinus (see Fig. 142). 
After the horn is removed and the fistula followed up, it 
is sometimes found that what we at first thought was its 
end, it may now be continued in an altogether different 
direction. 
It is again followed up with the probe, and the horn and 
sensitive structures excised until we are quite certain we 
have reached its furthest extent. 
Attention should next be paid to the cartilage. Where- 
ever spots of necrosis are found, as indicated by the pea- 
green colour of the affected parts, they must be carefully 
excised. Oare should be taken in so doing to carry the line 
of excision some little distance around the visibly affected 
