220 DISEASES CLASS II. i. 4. 2. 



Neverthelefs, when the pain is great, a poultice mud 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 moilt without any difagreea- 

 ble preflure. See Clafs I. i. 3. 14. 



Ophthalmia equina. An inflammation of this kind is liable to 

 affect the eyes of horfes ; one cauie of which is owing to a filly 

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

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

 able to fall into their ears from the high racks in ftables ; 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 

 eflential 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. Pterigion. Eye-wing. A fpot of inflammation fometimes 

 begins on the in fide of the lower eyelid, or on the tunica albu- 

 ginea, and fpreads an intertexture of red veflels from it, as from 

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

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



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

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

 them repeatedly with lunar cauftic. See Home on the urethra. 

 Page 10 1. 



Mr. Hadley of Derby procured an ingenious inftrument to be 

 made to cut the veflels, 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 neceflity to hold them by a forceps. 

 The instrument v/as in the form of a corn-fickle, or the early 

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

 edge of the curve was (harp, 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 veflels. 



3. Tarfitis palpebrarum. Inflammation of the edges of the 

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

 pf the eyelafhes, and is frequently the caufe of their falling off. 



After 



