3 S DISEASES Class I. i. 3. 14, 



abforption in them ; and then lefiened, till all the matter is ab- 

 forbed, which is brought by the arteries, initead of being depo- 

 fed in the ulcer. 



M. M. This is promoted by bandage, by the forbentia exter- 

 nally, as powder of bark, white lead ; iblution of fugar of lead. - 

 And by the forbentia internally after evacuations. See Seel:. 

 XXXIII. 3. 2. 



In thofe ulcers, which are made by the contact of external 

 fire, the violent action of the fibres, which occafions the pain, is 

 liable to continue, after the external heat is withdrawn. This 

 ihould be relieved by external cold, as of fnow, fait and water 

 recently mixed, ether, or fpirits of wine, fuffered to evaporate on 

 the part. 



The cicatrix of an ulcer generally proceeds from the edges 

 of it •. but in large ones frequently from the middle, or com- 

 mences in feveral places at the fame time ; which probably con- 

 tributes to the unevennefs of large fears. 



14. Cornea obfufcatio. Opacity of the cornea. There are 

 few people, who have pafted the middle of life, who have not at 

 fome time fuffered fome flight fcratches or injuries of the cornea, 

 which by not healing with a perfectly fmocth furface, occafion 

 fome refractions of light, which maybe conveniently feen in the 

 following manner : fill a tea-faucer with cream and tea, or with 

 milk, and holding it to your lips* as if going to drink it, the im- 

 perfections of the cornea will appear like lines or blotches on tlie 

 furface of the fluid, with a lefs white appearance than that fur- 

 face. Thofe blemi flies of the eye are diftinguifhed from the 

 mufese volitantes defcribed in Oafs I. 2. 5. 3. by their being in- 

 variably feen at any time, when you look for them. 



Ulcers may frequently be feen on the cornea after ophthalmy, 

 like little pits or indentations beneath the furface of it*, in this 

 cafe no external application ihould be ufed, left the fear fhouid 

 be left uneven ; but the cure fhouid be confined to the internal 

 ufe of thirty grains of bark twice a day, and from five to ten 

 drops of laudanum at night, with five grains of rhubarb, if 

 necefiary. 



After ulcers of the cornea, which have been large, the ine-. 

 qualities and opacity of the cicatrix obfeure the fight : in this cafe, 

 could not a fmall piece of the cornea be cut out by a kind of 

 trephine about the fize of a thick bridle, or a fmall crow-quill, 

 and would it not heal with a tranfparent fear ? This experiment 

 is worth trying, and might be done by a piece of hollow fteel 

 wire with a (harp edge y through which might be introduced a 

 pointed fteel fcrew ; the fcrew to be introduced through the 

 opaque cornea to hold it up, and prefs it againft the cutting edge 



of 



