they became extream sick, and purged within half an hour, and the next morning all their Flesh was turned green to a wonder, nevertheless they recovered by degrees. The manner of the Application was only by laying on the Stone, and by two cross-bits of a very sticking _Diaculum_ Plaister binding it on, which he let not lie on past an hour or two, but I think not so long, took the Stone off, and put it into Milk for some time; some Stones were of much stronger Vertue than others. I proposed a piece of unquench'd Lime-stone to be apply'd to see whether it might not prove as powerful, but know not whether ever it was tried. But here one telling Mr. _Boyle_ the Story of this _Indian_, he approved the method of Cure, and said, an actual Cautery was the most certain Cure. The Poison, both of Viper and Mad-Dog (as I conceive) kill by thickning of the Blood, after the manner that Runnet congeals Milk when they make Cheese. Vipers, and all the Viperous Brood, as Rattle-Snakes, _&c._ that are deadly, have I believe their Poisonous Teeth Fistulous, for so I have observed that Vipers Teeth are, and the Rattle-Snakes very remarkable, and therefore they kill so very speedily by injecting the Poison through those Fistulous Teeth into the very Mass of Blood; but the bite of Mad-Dogs is oft of long continuance before it get into and corrupt the Mass of Blood, being it sticks only to the out-sides of the Teeth, and therefore when they bite thro' any thickness of Cloaths, it rarely proves Mortal, the Cloaths wiping the Poison off before it come to the Flesh. A Girl that was bit about _New-Years Day_, continued well till _Whitsontide_, when coming to see certain Friends in our Parts, she fell very ill, and being a Poor Girl, they came to me; it pleased God I recovered her. Sometime after she returned to give me thanks for saving her Life, being two Persons that were bit with the same Dog, were dead, whilst she remained under Cure, and therefore she was the fullier convinc'd she owed her life to me; but of this I shall give a more particular Instance by and by. But the Poisons of Vipers seems to be like the injecting of Liquors into the Veins of Creatures; Dr. _Moulin_ and I made many Experiments of this Nature together, and I have made many more by my self. We once, I remember, injected half a Dram of Allom into the Jugalar-Vein of a Dog before the _Royal Society_, (the Allom being only dissolved in a little Water) which within something less than one Minutes time was so absolutely dead, as not to have the least Convulsive Motion; and I have done the like with many other things besides Allom, but with some things it is more curdled and broken, than with others; and will differ much both as to colour and consistence. Salt-Petre kills much as quickly as Allom, but then the Blood in the Heart looks very florid, smooth, and even. I wish some Person of Observation and Leisure would prosecute these sort of Experiments,