DISEASES OF THE LATERAL CARTILAGES 349 
Where a counter-opening is thus made it is found that it 
very readily closes with granulation tissue, and the purpose 
for which it was made defeated. This may be avoided by 
the use of a seton. In preference to the seton, however, we 
ourselves would advise that the opening be kept free by the 
occasional use of a sharp-edged director or a fine scalpel. 
An interesting modification of the practice of making 
a counter-opening is that related by Veterinary - Captain 
S. M. Smith.* In point of severity it runs a middle course 
between the making of a simple counter-opening and the 
removal of a wedge-shaped portion of the coronary band 
and the wall, a method which we shall later describe. 
To perform this operation, the animal is cast and chloro- 
formed. The foot is fixed and the parts thoroughly cleansed. 
The horn of the wall is then sawed through in a direct line 
from the coronary margin to the solar edge, the saw-line 
running exactly over the seat of the sinus. , 
A strong scalpel is now introduced at the coronary opening, 
with its cutting-edge outwards, and is gradually passed 
down the opening made by the saw. In this way the sinus 
is completely destroyed, and from end to end converted into 
an open wound. The parts are then washed in a perchloride 
of mercury solution, covered with a mixture of powdered 
iodoform and boracic acid, over which a pledget of carbolized 
tow is placed, and then a bandage over the whole. This 
dressing should be left on three or four days, after which 
the injury should be treated as an ordinary wound. In 
conclusion, the author says: ‘I can safely recommend this 
line of treatment to any practitioner having an obstinate 
case under treatment.’ 
Removal of the Wall and Excision of the Necrotic Tissue. 
—This we may term the radical operation for sub-horny 
quittor, for it is often productive of a successful issue when 
all other means have failed. No matter in what position 
the sinus is, whether at the extreme anterior portion of the 
coronet, or whether in the region of the heels, it is to be~ 
thoroughly opened up. To do this, the fistula is carefully 
* Veterinary Record, vol. ii., p. 157. 
