CHAP. I.] BUCK-EYE ; LARGE EYE ; BLINDNESS. 557 



the constant feverish state in which his great ex- 

 ertions keep him, which occasions inflammation, 

 and thickening of the extremely thin membrane 

 that covers the eye. To discover when this mis- 

 fortune has commenced, place the horse within the 

 stable door, or under a pent-house looking out- 

 wards ; then get behind the head and look sideways 

 through the eye towards the light, whereby you as- 

 certain whether it be clear and transparent as it 

 ought, or whether any specks are discoverable, that 

 denote the coming on of & cataract, or perhaps an ill- 

 cured opacity of the vitreous humours. Now bring 

 the horse's head to the stable door, and placing 

 yourself opposite him, in that situation examine all 

 the parts, as well the crystalline lens in the centre, 

 as the uvea, and the haw, of the eye. Whenever 

 any speck, or inequality is perceptible, look closer 

 to discover precisely what part is affected. The 

 most common defect is one of original construction, 

 and consists of round projections of the ball, chiefly 

 on the lower edge of the uvea or iris. In this 

 situation they are of no actual disservice ; but on 

 the other hand become very much so when found 

 on the crystalline lens ; for the uvea being capable 

 of expansion and dilatation, these spots appear and 

 disappear before the animal's sight, and cause skit- 

 tishness. 



Blear eyes, caused by a thickening of the 

 aqueous humour or tears, is termed " moon-eyed," 

 from its increase with the moon; this moreover 

 decreases with the changes of the moon, and is 



Bb3 



