72 FISTULA IN ONE OF THE TITS ABOVE THE EYE. 
speak : we should not, perhaps, forget them, if a cas^of single 
kidney should ever present itself in our post-mortenr examina- 
tions. If one of the arteries is wanting, there is still a small 
vessel ramifying upon and lost in the cellular tissue of the part 
that should be occupied by the bladder; and if the supposed single 
kidney is carefully examined, it will turn out that it was only 
in appearance single, and was actually composed of the two 
blended together. — Y.] 
A SINGULAR FISTULA IN ONE OF THE PITS ABOVE 
THE EYE (UNE DES SALIERES). 
By M. Merle, of Btztnas. 
On the 21st of May, 1S30, I was desired to examine a bay 
horse, six years old, that during the last fifteen days had fed with 
considerable difficulty. It had a large tumour which occupied the 
space between the eye and the forehead on the left side. I de- 
termined to lance it at the spot corresponding with the pit of the 
eye, and a great quantity of the spikes of brome-grass (Bromus 
hordereceus) immediately protruded. I cleared them away, and 
threw in some detersive injections ; but on account of the direc- 
tion of the fistula, neither the injected fluid nor the suppurative 
matter could escape, and it was necessary to absorb them by 
means of a piece of sponge. I, however, assured myself of the 
depth of the fistula by means of a gum elastic sound, which, being- 
introduced above, was gradually pushed into the cavity of the 
mouth. I then passed a straight sound, which I brought out at 
the right commissure of the lips. I attached to one end of this 
probe a long piece of tow, terminating in a point, and moistened 
with tincture of aloes. With some management I introduced it 
into the whole of the fistulous passage. 
On the following day we removed this pledget, in order to intro- 
duce another, charged with an active digestive ; but in the act of 
mastication it got between the molars, and was broken, and it was 
necessary to renew it every two or three days. If we neglected 
this, the pit of the eye would again become filled with that bv 
which it was before distended ; the animal would be sadly incon- 
venienced by it, and refuse to eat. During a month, the fistula 
was dressed in this manner, namely, by the occasional introduction 
of fresh pledgets of toAV. Finding the inconvenience that resulted 
from the passage of the seton into the mouth, I attempted to give 
