PHYSIOLOGY OF THE EYE OF THE HORSE. 569 
tage : laxative and diuretic medicines, exhibited at intervals, 
will also prove serviceable. 
Amaurosis, ov gutta serena, or the glass eye of farriers, denotes 
that state of the nervous structure immediately concerned in 
vision, in which it becomes partly or entirely insensible to light. 
The characteristic symptoms of this disease are, a preternaturally 
dilated pupil, remaining the same in a strong or weak light, 
aud which, so far from betraying any visible defect, has an 
unusually lucid or glassy aspect. It is simply a state of nervous 
insensibility, referrible, in every case that I have seen, to injury 
or disease of the brain. 
Mr. Percivall states, that this effect can also be produced by 
application of belladonna to the eye. Professor Coleman relates 
a case of a horse of his own that received a blow upon the side 
of the head from falling backward, and, after the fall, hemiplegia 
attacked the opposite side of the head, and the corresponding 
eye became amaurotic. Bleeding, purging, and stimulants to 
the insensible eye, produced a perfect recovery in this horse. 
In conclusion, gentlemen, it falls to my lot to broach a subject 
that seems either entirely unknown to our veterinary surgeons; 
at least, I cannot find it in the places where I should expect to 
gain information about it. It is a disease that I have met with 
four or five times, viz. matter found in the chambers of the eye, 
and which is of a semicircular appearance, from, as I suppose, 
the form of the chambers. I considered the matter to be 
secreted by the iris, but I could not discover the cause of the 
secretion in either case. The remedy, however, is simple, viz. 
puncturing with a small lancet at the dependent part of the eye, 
and afterwards applying cold lotions. 
Gentlemen, I have brought these imperfect remarks to a close, 
and only regret that so very interesting a subject did not fall 
into abler hands. 
SINGULAR DISEASE IN THE EYE OF A FOWL. 
By MM. Dupuy and Prince. 
About the middle of December 1831, an enzootic disease 
among fowls prevailed in the neighbourhood of Muzet. 
One of them was sent to us to be examined. It trembled— 
it had frequent shivering fits—it was chilly, and got as near to 
the fire as it could. It was exceedingly emaciated, yet it ate 
well. Its left eye seemed to be much enlarged, and the eyelids 
being separated, there was brought into view a white mass, move- 
