To proceed, this Discovery agrees very well with a Relation communicated by an Ingenious Person to Dr. _Tyson_, which does so much illustrate this Matter, that I shall transcribe it in his own Words, out of the before cited _Philosophical Transactions_; he says then, That being in the _Indies_, there came to him an _Indian_ with several Sorts of _Serpents_, offering to shew him some Experiments about the Force of their Poison; having therefore first pulled out a large One, the _Indian_ told him this would do no Harm; and making a Ligature on his Arm as in letting Blood, he exposed it naked to the Serpent, being first irritated to make him bite it; the Blood that came out of the Wound made by his Teeth, he gathered with his Finger, and laid it on his Thigh, till he had got near a Spoonful, after this he takes out another called _Cobra de Capelo_, which was lesser, and inlarges much upon the Greatness of his Poison; to shew an Instance of it, grasping it out about the Neck, he expresses some of the Liquor in the Bags of the Gums, about the Quantity of half a Grain, and this he puts to the coagulated Bleed on his Thigh, which immediately put it into a great _Fermentation_, and working like _Barme_, changed it into a _Yellowish_ Liquor. This I say does well enough accord with what we have been advancing concerning the Nature of this _Juice_, for Mr. _Boyle_ has long since proved by Experiments, that there is nothing of Acid in human Blood; and Dr. _Pitcarn_ (14) has demonstrated, that the _Acid Substances_ of Vegetables taken into the Stomach, are by the Action of this Part, the Lungs and Heart, when they come into the Blood-Vessels, turn’d to _Alcalious_; so that the Arterial Fluid must necessarily be considered as an _Alcali_; and therefore according to the known Principles of Chymistry, its mixture with such a Liquor as we have discovered the Viperine _Sanies_ to be, will always exhibit some such appearance as this now related.