Pruna.
AVicenna. lib. 4. Fen. 3. tract. 1. describeth Prunam,* 1.1 and Ignem persicum, bothe in one chapiter, not without some confusion of the one with the other, and bothe with Formica. First estemyng both the names, to serue for euery blysteryng, corrosiue, and eschare makynge pustule. And a little after he sayeth, that Pruna is that, whiche maketh the place blacke as a cole, without moisture, hauynge a small eminence lyke a lupine, somtyme with a pustule and som∣tyme not: hauyng itche ouer all. And somtyme dothe Ignis persicus or Pruna, more larglye blyster, and purge suche a quitture, as a place burned or cautrized doth. The place be∣ing ashe coloured, blacke, or leady, and compassed aboute with a vehement inflammation without perfecte rednes. And agayne, Ignis persicus is the more sharpe, and of the swyster apparition, and motion: Pruna the slower, and lying deper. The beginnyng of both is of burned choler myxed with melancholie, (and therof commeth the blacke eschare in both.) Ignis persicus consisting of the vehementer choler, and Pruna of the myghtier melancholye. It they chaunce in the fleshe, they are the soner resolued: but if in the sinewes, they sticke the faster, and resolue the slowlyer. Thus farre Auicen. And yet confessyng after, that the name of eyther, may be geuen to both: and affirmeth them often to come of a pestilentiall feuer.
Nowe Pruna and Carbunculus, in the qualitie of names as you see differ not: and howe muche their efficient causes, signes, and propreties doe varie: After these descriptions therof, by comparing them together, it is easy to see.