114 
DISEASES OF HORSES IN INDIA. 
TO the two articles of Worm in the Eye” contained in our 
last Number, we have much gratification in having it in our 
power to add a third and more digested account from the pen of 
a Surgeon in India, who has the superintendance of one of the 
Company's studs. The Society to which this paper was pre¬ 
sented we believe to be the Medical Society at Calcutta, 
OBSERVATIONS ON THE FILARIA OR THREAD WORM, FOUND 
IN THE EYES OF HORSES IN INDIA. 
W. Twining, Esq. Presented October 2, 1824. 
IN presenting to the Society, observations and remarks on a 
singular disease incident to the eyes of horses in India, I am 
actuated by an earnest wish to conduce to farther investigations, 
which may possibly more fully develop the phenomena that 
usually attend it. 
The worm, which is very small, is found alive in the aqueous 
humour of the eye: its existence in that humour is easily de¬ 
tected, and its local effects on the eye in occasioning a deep- 
seated inflammation of the globe of the eye, and turbidness in 
the aqueous humour, are well known in this country: but it is 
still hypothetical how the worm is generated in the eye. Horses 
affected with the worm in the eye are subject to weakness of 
the loins ; and these incidents occur together so frequently, that 
the natives very generally believe the latter to be the conse¬ 
quence of the former affection. 
When on a tour in Upper India, in December last, I saw a 
remarkably fine Arab horse, which had the aqueous humour of 
one eye of a bluish milky colour, and so turbid that the pupil 
was not visible ; the lids were kept'half closed, deep-seated vas¬ 
cularity of the eyeball was manifested, and there was redness 
of the conjunctiva, but no lacrymation. A few days after¬ 
wards, the worm was seen swimming almost incessantly in the 
aqueous humour, and its motions where somewhat similar to 
those of a leech in water. In the eye, this worm had the ap¬ 
pearance of a white thread; but, owing to the turbid state of 
the aqueous humour, it was seldom seen, except it approached 
near the cornea. 
This worm was extracted the dav after its existence in the eye 
