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Some Observations of Vipers.
A curious Italian, called Francesco Redi, having lately had an opportunity, by the great number of Vipers, brought to the Grand Duke of Toscany for the composing of Theriac or Treacle, to examine what is vulgarly deliverer and believed concerning the Poyson of those Creatures, hath, (according to the account, given of it in the French Journal des Scavans, printed January 4. 16656) performed his undertaking with much exactness, and publish't in an Italian tract, not yet come into England, these Observations.
1. He hath observed, that the poyson of Vipers is neither in their Teeth, nor in their Tayle, nor in their Gall; but in the two Vesicles or Bladders, which cover their teeth, and which coming to be compressed, when the Vipers bite, do emit a certain yellowish Liquor, that runs along the teeth and poysons the wound. Whereof he gives this proof; that he hath rub'd the wounds of many Animals with the Gall of Vipers, and pricked them with their Teeth, and yet no considerable ill accident follow'd upon it, but that as often as he rubbed the wounds with the said yellow Liquor, not one of them escaped.
2. Whereas commonly it hath hitherto been believed, that the poyson of Vipers being swallowed, was present death; this Author, after many reiterated Experiments, is said to have observed, that in Vipers there is neither Humour, nor Excrement, nor any part, not the Gall it self; that, being taken into the Body, kills. And he assures, that he hath seen men eat, and hath often made Bruit Animals swallow all that is esteem'd most poysonous in a Viper, yet without the least mischief to them. Whence he shews, that it needs not so much to be wondred at, that certain Empiricks swallow the juyce of the
