self, That it was not impossible for these parts to consist wholly of Vessels curiously wrought and interwoven (probably for more Uses, than is yet known;) And the {317} consideration, which came into my mind, of a piece of fine Cloth (which consists of so many several minute Hairs, call'd _Wool_) was no discouragement to this opinion. Yet I durst not be presumptuous as to indulge my self too much in it; much less to venter presently to speak of such a thing, which seem'd to contradict so many Learned Men's belief. But being restless, till I might receive more satisfaction in the thing, I iterated experiments over and over; some of which prov'd so successful to my apprehension, that I was encouraged in the year 1663. and 1664 to discourse of it to several very worthy Persons, as Mr. _Boyl_, Sir _William Petty_, Dr. _Williams_, Dr. _Lenthal_, Dr. _Jaspar Needham_, Dr. _Samson_, (who afterwards sent me a Letter from _France_, intimating the acquaintance he had made with the learned _Steno_, who hath since published something of the same Discovery) Mr. _Daniel Cox_, and Dr. _Samuel Parker_, &c, who doubtless cannot but remember, that then I related to them, I found much cause to believe, that that substance commonly called _Parenchyma_, was in most, if not in all its _Parenchymous_ parts, full of Vessels; however it had been imagin'd by all, I could ever meet with, to consist in great part of a substance, in many places void of Vessels, designed for such uses, as are above mentioned.