( ‘ 8i )

such Firm and Solid Productione from Fluids, when we consider that there srtParticles Floating in the Blood, always dispolid to beconvertcd intoG 'rtstles ortomakeup the Solid Skull, Nails, Bones, &c. and that even the Teeth, wsios:

Ttxture is v<?ry Firm, are Made and sopply’d out of the Soft Fluids of the Bo-dy. Even someol thefe Solid Parts of theBody may by a Fifeaje of fh ehUodbe Abraded,and Abscrbed by the common Fiuid, and Precipitat d by their ownWtightupon the Pel-vis, or elfe 11 ick in the Tu bules of the Kidneys , and sochoak rhem up, and by degrets extend them to a Rupture, or gritid themto pieces by a constant Impulse of this Gritty Substance, which may at lastconvtrt the greattst part of the KsJntjs into this Firm Concrete. Morcoverwithout any respect had to thefe Solid Abrasion?, the Blcod it seif (of■which the Serum is a great part, and with which it is inrimately mixt)conlists of Heterogeneous Particles, of so various Forms, Sizes andShapes,which sfcms nccestary for their accommodatirig themsclves to all Part«-that even thefe delign'd to constitute the Solid Parts, may süßer soch ir-regulär Changes in the Body, which may unsit them to paß the EmulgentVein, and so to continue their Circulation : Insomuch that the continu d Im-pulse of this Matter by the Artery , may make very considera ble Aggre-gatts or Concretms in the Kidneys. And not only so, but without either re-spect to Vein or Artery, the Senns or Watry part of the Bloood , which wesäid before was the Vehicle of the Stove, may have imbibed such Heteroge-ncous, Grossand Ponderous particles, as may, whilst in Motion and Agita-tion through the Vems and Arteries, fluctuate and mix well enough together,but may very easily separate upon the lea Stagnation. Thus the variousMixtures in a Torrent feem to make up one Homogeneous Fiuid, but ifsome part of this Fiuid happen to fall into a Pit, or Stagnate in aquier place,weshall findifclear it seit of Mud, and other Differingparts.

That the Nature of this Concrete seems rathet referable to Borte, than toany other Consistent or Fiuid Part of theBody, I concluded by comparingtheir Chymical Products. Having clear’d the Bone of Marrow and Tat, byBoyling it in Water, I DistiWd it, and obrain’d about 2 Drams and an'halffrom an Ounce of Bone, of a Volatile Liquor Impregnared with Salt, thatSmelt very much like that I have mention d ; which was very differing fronrSftnt of Unne, and nearer that of Harts-Horn : I found the Caput Mortuum ,as to Weighf, very consonant ; and also could Extract no mannet of Saltfrom it. For which Reason Refiners make their C.uppels of Calcirüd Bcnesthey being forc’d to Dulcify (which they call washmg out the Saks of)other Aßies, before they can make Cuppels of them. Last of all, it hereinalso agrees with the Calculus Humanus, vulgat ly so term'd, that few Acidswill dissolve it, excepting those that are Nitreus, nor do these work on itvery Vigorously. But herein they muss be allow'd to differ in their SpecißckGravity ■, the C 'alculus not having so dose and compact a Text ure as theBones have. For Bones I have found twice as Heavy as their Bulk ofWatet. StVerul Comfj-

Several Stores of the Bladder and Kidneys were Distill'd, and all afforded ZZsVolatile Urincus Sahst which Ferment upon any Acids ; Bones were DifltlUd Stone '>

* 1 tbin^s. Ib .

and p, yj 2 ..