Take a Cock chicken, pull off the feather till the Rump be bare, then hold the bare fundament of the Chicken to a Plague Sore and it will attract the Venom to it from all parts of the body and dye; when he is dead, take another and use likewise; you may perceive when all the Venom is drawn out, for you shall see the Chicken no longer pant nor gape for breath; the party sick will instantly recover.
Got it--now we just need to find some chickens...
To see this cure and many others, as for Culpeper's School of Physick (London: Obadiah Blagrave, 1678), Rare R128.7 .C84 1678.