There are two sorts of cucurbitals: the one of copper, the other of horn. That of copper is open at the one end, and close at the other; that of horn is likewise open at one end, and at the other has a small hole. Into the copper one burning linen is put, and its mouth is clapt close to the body, and is prest down, till it adhere to it. The horn kind is only applied to the body, and after that, when a person has sucked out the air by the small hole, and that is closed with wax, it sticks, as well as the other. Both of these are made not only of these two materials, but of any thing else. Where no better can be got, a small cup with a narrow mouth is fit enough for the purpose. When it adheres, if the skin has been cut before with a scalpel, it will bring out blood: if the skin is whole, air. Wherefore when the offence is from matter contained within, the first method is to be pursued: when it is only a flatulency, the other is commonly used.

Now the principal use of a cucurbital is, when a disorder is not in the whole body, but only in a part, the emptying of which is sufficient to render it sound. And this very thing is a proof, that in the cure of any member, bleeding by a lancet too is to be performed rather in the part which is already hurt: because no body puts the cucurbital upon a different part, unless to divert the flux of blood thither, but on that, which is diseased, and which is to be relieved.

There may possibly be a necessity for using the cucurbital in chronic distempers (although they be already of some standing) if there be either corrupted matter, or a flatulency. Likewise in some acute distempers, if at the same time the body requires to be lightened, and the strength will not admit of bleeding from a vein. And this remedy, as it is less violent, so it is more safe; and is never dangerous, though it be made use of in the greatest violence of a fever, or even in the time of crudity. For this reason, when there is a necessity for bleeding, if the opening of a vein is very dangerous, or the disorder is fix’d in a noble part of the body, we must also have recourse to this instrument. We must be sensible however, that as it is attended with no danger, so it gives a feebler aid; and that is not possible to relieve a violent distemper, but by an equally violent remedy.