The Cautery is an Ulcer which is made in the Skin, by applying Causticks to it, after this manner:
The Surgeon having moisten'd the Skin for a while with Spittle, or else having caus'd a light Friction to be made with a warm Cloth, applies a perforated Plaister to the Part, and breaks the Cautery-Stone, to be laid in
the little Hole, leaving it for a longer or shorter time, accordingly as he knows its Efficacy, or as the Skin is more or less Fine. Afterward he scarifieth the Burn with his Lancet, and puts a Suppurative, or piece of fresh Butter into the Part, till the Escar be fallen off.
The Dressing and Bandage.
After the Application of the Lapis Infernalis, or any other Cautery-Stone, it is necessary to lay over it a Plaister, a Bolster, and a Circular Bandage, which ought to be kept sufficiently close, to press the Stone, after a Pea or little Piece of Orrice-Root, hath been put into the Ulcer to keep it open. Then the Patient is to make use of this Bandage, with which he may dress it himself. Take a piece of very strong Cloth, large enough to roll up the Part without crossing above it: And let three or four Holes be made in one of its sides, as many small Ribbans or Pieces of Tape being sow'd to the other, which may be let into the Holes, as occasion serves, to close the Band.
C H A P. XXXIV.
Of the Application of Leeches.
It is requisite that the Leeches be taken in clear running Waters, and that they be long and slender, having a little Head, the Back green, with yellow Streaks, and the Belly somewhat reddish. Before they are apply'd, it is also expedient to let 'em purge during some Days in fair Water, fast half a Day in a Box without Water. Afterward the Part being rubb'd or chaf'd with warm Water, Milk, or the Blood of some Fowl, the Opening of the Box is to be set to the Part, or the Leeches themselves laid upon a Cloth; for they will not fasten when taken up with the Fingers. The end of their Tail may be cut with a Pair of Sizzers, to see the Blood run, and to determine its quantity, as also to facilitate their sucking. When you wou'd take 'em away, put Ashes, Salt, or any other sharp thing upon their Head, and they will suddenly desist from their Work; but they are not to be pull'd off by force, lest they shou'd leave their Head or Sting in the Wound, which wou'd be of very dangerous consequence. When they are remov'd, let a little Blood run out, and wash the Part with salt Water.