When this is superficial, it always appears white; but when it is deeply rooted, it tends to blackness, and is scarce curable. That which follows an inflammation of the eye, generally disappears without any application. To take off this, it is common to mix a little su gar candy with the water of fennel or eye-bright, or the juice of fennel or celandine; or these last may be mixt with a few drops of the balsam of Peru; when the juice of celandine is used alone, it will be proper to dissolve a little gum tragacanth in it to soften it; but the blew or sapphire coloured water of the shops, is as useful as any thing, dropt into the eye; or rather the spot should be touched with a hair pencil dipt in the water.