SOME CLINICAL OBSERVATIONS. 
351 
the infero-posterior part of the joint, in the region corresponding 
to the tarsal arch. A year later, the swelling has considerably 
diminished, it feels puffy, not fluctuating, produces no lameness, 
but diminishes the value of the animal. 
Observation II .—A very handsome heavy draught horse, 
four-and-a-half years old, has on the left hock a tarsal tendi¬ 
nous thorough-pin, as big as two fists, more developed on the in¬ 
side ; not laming the horse, but being a serious blemish, which 
it is desirable to remove. The iodine injection will be tried. 
The operation is performed with the trocar No. 2, of Dieulafoy’s 
apparatus, and the syringe connected with it. The entire syn¬ 
ovial collection is removed and replaced by a nearly equal quan¬ 
tity of solution composed of tincture of iodine (to the 12th), 10 
parts ; distilled water, 20 parts ; iodide of potassium q. s., to 
make a limpid solution. This was allowed to remain half a 
minute only in the tarsal sac, and was withdrawn by aspiration 
with the Dieulafoy’s syringe. The operation was performed 
without complication 5 the immediate sequellse were very sim¬ 
ple ; the inflammatory swelling not excessive; the lameness 
trifling. Eight days later, the hock is larger than before the 
operation, the animal is removed home, with directions that he 
should do light work for a couple of weeks and then return to 
his ordinary duty; A month after, the thorough-pin has notice¬ 
ably diminished, and the horse is used to work requiring power¬ 
ful efforts; he works as a shaft horse, with loads of 2,500 to 
3,000 kilos. Several months later, the thorough-pin is larger 
than before the operation performed five months ago ; it is soft, 
puffy, not fluctuating. Returned to the hospital to be treated 
for an attack of typhoid fever, fourteen months after the injec¬ 
tion of iodine, we observed that the hock is much reduced. It 
is smaller than at the time of the operation, but is there still. 
Is the failure due to the short sojourn—half a minute—of the 
iodined solution, or to the violent efforts of the work performed 
too early, a month after the operation ? We incline to believe 
that the first cause is most likely the correct one ; on that ac¬ 
count, since that failure we leave the injection one and even 
two minutes in the sac, according to the length of time since 
the lesion has existed, and also the supposed irritability of the 
subject. 
A Case of Poee-Evie. —A mare, aged seven years, had a 
diseased condition of the poll for seven months. At first it 
manifested itself in the shape of an atloid hygroma, then came 
fistulae and the mare could not be used, as she could not carry a 
