LAMENESS AND POLL-EVIL CAUSED BY ENTOZOA. 5 
of the tissues or fluids of the body, they were surprisingly uniform. 
The poll-evil was treated in the ordinary way, and after some 
weeks had elapsed the horse was lent to a farmer, who used him 
for his keep, and he informed me that he worked very well and 
was free from lameness. He had him about ten'days. One shoulder 
was bruised by the collar, and a soft tumour formed, similar to that 
upon the poll. With an accumulation of evilsfdike these, I found 
that the subject of my experiment was likely to be much “ more 
plague than profit and with some reluctance, therefore, I had him 
destroyed. Upon examining the tumour upon the shoulder, it was 
found to contain the same linseed oil-like fluid, and a few of the 
same white bodies as were in that of the poll. Upon dissecting 
back the perforatus tendon some days after death and exposing 
the perforans, the latter exhibited disease of so peculiar a cha- 
racter that I attempted a coloured drawing of it. The tendon 
itself was, as you will observe, greatly thickened, and had lost 
much of its density. Upon cutting through its body, in its centre 
was a cavity containing ash-coloured pus; but the most striking 
object, and one of great curiosity, presented itself about three 
inches above the fetlock, in the original seat of the lameness. 
It resembled the hip, the fruit of the dog-rose, embedded in the 
tendon, slightly projecting, and covered by the enveloping mem- 
brane, giving to that membrane a bright red colour, made up, in 
part, of minute red bloodvessels visible enough to the^eyesight. 
This bright colouring was circumscribed to a line, and principally 
contributed, together with a projecting roundness of form, to afford 
it the resemblance before alluded to. Below, there was a faint 
blush of redness extending downwards and over one-half of the 
tendon — the affected side ; above, and on the other half, it was of 
its natural colour. Upon cutting into it, my surprise was much 
heightened in beholding another of the previously described white 
bodies emerge, accompanied with fluid. It was encased in a dense 
cyst, the interior of which was smooth and glistening ; it was 
three-fourths of an inch in length. Situate beneath, and rather on 
one side of it, I found two others. Two or three inches below, upon 
the same side of the tendon, a soft protrusion was also seen. It 
was cut into, and found to form a canal of communication with the 
interior of the part before described, where these bodies were depo- 
sited. In the course of this canal the tendon wasfflabby to the 
touch. No opening could be discovered by which these parasites 
(for such, I am informed, they were) obtained their entry ; the 
lower swelling merely feeling very soft. My previous suspicion, 
upon opening the tumours of the poll and shoulder, that they were 
organized bodies, became greatly strengthened. In further con- 
firmation of the fact, 1 placed one of them in the hands of a scien- 
