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sign) upon Blood yet warm, as it came from the Animal, viz. That by putting into it a little Aqua-fortis, or Oyl of Vitriol or Spirit of Salt, these being the most usual Acid Menstruums) the Blood not only would presently lose its pure colour, and become of a dirty one, but in a trice be also coagulated; whereas if some fine Urinous Spirit, abounding in Volatil Salt, such as the Spirit of Sal Armoniack, were mingled with the warm Blood, it would not only not curdle it, or imbase its Colour, but make it look rather more florid than before, and both keep it fluid, and preserve it from putrefaction for a long time.
This Experiment I devis'd, among other things, to shew the Amicableness of Volatil Spirits to the Blood. And I remember, 'twas so much taken notice of that some very inquisitive Members of the Society came presently to me, and desired me to acquaint them more particularly with it; which I readily did, though afterwards I made some further Observations about the same Experiments, that I had no occasion to relate.
This having been so publickly done, though I shall not say, that Signor Fracassati may not have hit, as well as I, upon the Experiments published in his Name, yet there is so little difference between the warm Blood of an Animal out of his Veins and in them, that 'tis not very improbable, that he my have had some imperfect Rumour of our Experiment without knowing whence it came, and so may, without any disingenuity, have thence taken a hint to make and publish what now is English'd in the Transactions. If it be thought fit, that any mention be made of what I related so long since, I think I can send you some other Circumstances belonging to it: For I remember, I tried it with other Liquors (at Spirit of Wine, Oyl of Tartar, Oyl of Turpentine) and I think also I can send you some Remarks upon the Colour of the upper part of the Blood. And I shall on this occasion add, in reference to Anatomical matters in general, that after I saw how favourably the usefulness of Experimental Philosophy was receiv'd, I was invited to inlarge it in another Edition; and for that, I provided divers Anatomical as well as other Experiments, and designed many more, so that I have by me divers things that would not, perhaps, be unwelcome to Anatomists, &c.
This Observation should have been added to those that were publish'd in Num-
