4 
LAMENESS AND POLL-EVIL CAUSED BY ENTOZOA. 
May 23 d, 1846. — He had been put to work a few days, and 
again became lame ; was rested again, and similar treatment to 
the foregoing was resorted to ; and, subsequently, as the ailment 
still remained, he was fired : but it proved ineffectual. It was 
repeated with severity, and long-continued rest enjoined. 
Sept. 20 th. — Visited my patient and found him turned into 
a meadow quite lame, and the leg enlarged. He was, by my 
desire, again confined, and absolute rest for some months insisted 
upon. 
Oct. 11th. — Saw the colt — free from lameness. 
March 5th, 1847. — After this long interval I was requested to 
see the grey colt once more. The son of my employer informed me 
that his father, disliking to see the colt confined, shortly after I 
last saw him, as he seemed to go sound, had had him turned into 
a meadow, and that the lameness soon re-appeared. I believe he 
was then submitted to the inspection of a neighbouring farrier, as 
the shoulder bore marks much resembling those of the firing-iron 
lightly used. Be that as it may, I was told that he became so exces- 
sively lame that it was imperative to take him into a farm-yard ; 
where I found him so dreadfuly crippled as to be able to put his 
toe only to the ground, carefully avoiding the pressure upon the 
posterior parts of the leg which bringing the heel down must neces- 
sarily inflict. It was then arranged that the horse should be sent 
to my stables. 
The leg had become much enlarged from often-renewed lame- 
ness. I discovered fluctuation and swelling midway between the 
knee and the fetlock. I introduced the lancet, and a considerable flow 
of fluid resembling discoloured synovia followed. It afforded relief 
for some days. I now first began to suspect that there was proba- 
bly ulceration of the sheath, which a post-mortem examination fully 
verified. I now despaired of any remedy ; but it occurred to me 
that unnerving might possibly be a fair experiment I performed 
that operation immediately below the knee, removing two inches 
or more upon each side. The horse, afterwards, walked perfectly 
well. Previous to this I had purchased him, as he was ordered to 
be destroyed. I was solicitous to try the experiment, but it proved 
to be a costly affair. 
During the time the incisions were healing, to my great mortifi- 
cation a large soft tumour formed upon the poll. It was freely laid 
open. A flow of glairy fluid resembling linseed oil ensued, accom- 
panied by a great number of small flat bodies — together they would 
have filled a common egg-cup ; they were quite white, compact — 
even tough, and so much alike — although not perfectly so — so like, 
in fact, the fluke- worm in shape, that I doubted whether they were 
not of that family. If they were the production, by disease, of any 
