22o DISEASES Class II. i. 4. 2. 



Neverthelefs, when the pain is great, a poultice muft be ap- 

 plied to keep the eyes moift, or a piece of oiled filk bound light- 

 ly over them. Or thus, boil an egg till it is hard, cut it longi- 

 tudinally into two hemifpheres, take out the yolk, few the backs 

 of the two hollow hemifpheres of the white to a ribbon, and 

 bind them over the eyes every night on going to bed •, which, if 

 nicely fitted on, will keep the eyes moift without any difagreea- 

 ble preiTure. See Clafs I. 1. 3. 14. 



Ophthalmia equina. An inflammation of this kind is liable to 

 arret!: the eyes of horfes ; one Caufe of which is owing to a filly 

 cuflom of cutting the hair out of horfes' ears ; by which they 

 are not only liable to take cold at the car, but grafs-feeds are li- 

 able to fall into their ears from the high racks in {tables ; and 

 in both cafes the eye becomes inflamed by fympathy. I once 

 directed the temporal artery of a horfe to be opened, who had 

 frequent returns of an inflamed eye ; and I believed it was of 

 elTential fervice to him ; it is probable that the artery was after- 

 wards contracted in the wounded part, and that thence lefs blood 

 was derived to the eye : the haemorrhage was flopped by two 

 perfons alternately keeping their fingers on the orifice, and after- 

 wards by a long bandage of broad tape. 



2. Pterigiofn Eye- wing. A fpot of inflammation fometimes 

 begins on the infide of the lower eyelid, or on the tunica albu- 

 ginea, and fprcads an intertexture of red veiTels from it, as from 

 a centre, which extend on the whire part of the eye, and have 

 the appearance of the wing of a fly, from whence its name. 



M. M. Cut the ramifications of veiTels again and again, with 

 the point of a lancet, clofe to the centre of inflammation. Touch 

 them repeatedly with lunar cauftic. S.ee Home on the urethra. 

 Page 1 or. 



Mr. Hadley of Derby procured an ingenious inftrument to be 

 made to cut the veiTels, which had fpread their numerous 

 branches over an opaque cornea, after a violent inflammation ; 

 by which they were repeatedly divided, with little pain to the 

 patient, as there was no neceifity to hold them by a forceps. 

 The inftrument was in the form of a corn-fickle, or the early 

 crefcent of the new moon, about an inch in length, the inner 

 edge of trie curve was fharp, and the point fine ; the back was 

 rounded and fmooth, and the other end fixed in an ivory han- 

 dle. The point of this was fuddenly introduced under the 

 branches of the new veiTels, which were thus cut upwards, and 

 there was no occafion to hold the eye, or the trunks of the veiTels. 



3. Tar/itis palpebrarum. Inflammation of the edges of the 

 eyelids. This is a difeafe of the glands, which produce the hairs 

 of the eyelafhes, and is frequently the caufe of their falling ofF. 



After 



