forget to acquaint the Reader, that having had the liberty granted me of making some trials on a piece of _Lignum fossile_ shewn to the Royal Society, by the eminently Ingenious and Learned Physician, Doctor _Ent_, who receiv’d it for a Present from the famous _Ingenioso Cavalliero de Pozzi_, it being one of the fairest and best pieces of _Lignum fossile_ he had seen; Having (I say) taken a small piece of this Wood, and examin’d it, I found it to burn in the open Air almost like other Wood, and insteed of a resinous smoak or fume, it yielded a very bituminous one, smelling much of that kind of sent: But that which I chiefly took notice of, was, that cutting off a small piece of it, about the bigness of my Thumb, and charring it in a _Crucible_ with Sand, after the manner I above prescrib’d, I found it infinitely to abound with the smaller sort of pores, so extreamly thick, and so regularly perforating the substance of it long-ways, that breaking it off across, I found it to look very like an Honey-comb; but as for any of the second, or bigger kind of pores, I could not find that it had any; so that it seems, whatever were the cause of its production, it was not without those small kind of pores which we have onely hitherto found in Vegetable bodies: and comparing them with the pores which I have found in the Charcoals that I by this means made of several other kinds of Wood, I find it resemble none so much as those of Firr, to which it is not much unlike in grain also, and several other proprieties.