ON DISEASES OF THE EYES. 499 



to fimilar inconvenience ; the fame external 

 Inethod, with falts, and moderate bleeding, and 

 extirpation, or fihng down the preternatural 

 teetli. 



Humour-blindness, or Inveterate 

 Opthalmy. The whole eye is inflamed both 

 internally and externally, and the admiflion of 

 light occafions intolerable pain ; the proximate 

 caufe, I apprehend, to be either obftru6lion in 

 the capillaries, the blood being too denfe for 

 circulation, or a dilatation and weaknefs of the 

 veffels themfelves. This difeafe is curable with 

 two provifos ; being taken in time, and the eye 

 being naturally good ; otherwife the attempt at 

 cure is fruitlefs. For the defcription of a good 

 eye, I refer the reader to Vol. I. p. 195 ; if a 

 profeihonal man, to Gibfon. For the beft me- 

 thod of cure with which I am acquainted, I 

 {hall prefent the Reader with a remarkable cafe 

 from my memoranda. In 1781 my favourite 

 brown mare had a weeping in one of her eyes, 

 "With fwelling of the lids ; it pafled off, after a 

 while, unattended to ; a fliort time after, the 

 other eye was affefted in the fame manner. 

 Eye w^ater was ufed, and bleeding, and the 

 mare being wanted for a particular occafion, 

 was phyficed. The difeafe remitted and ex- 

 acerbated alternately, for a month or two, 

 until at length it became very ferious ; one eye 

 was exceedingly fwollen, and opened with great 



K K 2 difficulty. 



