Once more, he hath alfo demonftrated that one Grain of Sand will contain 125000000000000000000oooooo of the aforefaid Blood-Globules; that is 10256 Times more than the highest Mountain upon Earth contains Grains of Sand. Lastly, He hath fhewn the least Particle of Matter fhall be made to fill the greatest Space (fuppofe the Orb of Saturn) fo that there shall be no Pore therein, whofe Diameter fhall exceed the 1000000000000th, &c. of an Inch. CHAP. CHA P. IV. Of the Solidity and Figurability of A. BODIES. WHAT is that common Property W of Matter, or Body, which you call Solidity? B. Solidity is that Property, whereby a Body refifteth all others that prefs it on every Side, and whereby it hinders all other Bodies from entring into that Place which it poffeffeth, though they are forced against it ever fo violently. A. Then fuppofe I prefs a Body ever fo forcibly between my Hands, that Property which prevents my Hands from coming to a mutual Contact, you call Solidity, if I understand you right. B. Yes, I do fo; and this Property is the Ground or Cause of all Resistance in Bodies. A. Is not this a new Term for this Property? 2 B. Yes, B. Yes, it hath been formerly called Impenetrability; that is, whereby two Bodies cannot penetrate each other, or be in the fame Place at once. A. And is the Exchange of Impenetrability for Solidity, made on good Grounds think? do you B. A great Man made it, and a greater hath approved it; but under Favour of them, I think the Word Refiftance, expreffeth this Property much better than either of the other. A. I pray your Reafons for that? B. Impenetrability is a Negative, and therefore not fo proper; Solidity is ambiguous, for thereby we often express the Hardness of Matter; a Property entirely different from what is here intended by it, The Word Refiftance expreffeth the Thing afferted by each of those Names; and therefore (being neither improper nor ambiguous) is more fit than either of them. A. And is this Property of Matter the fame in liquid or fluid Bodies, as it is in hard or fix'd ones? B. The very fame; for a Drop of Water, or a Particle of Air, remaining fix'd between any two Bodies, will no less hinder their Contact, than an equal Quantity of Steel or Diamond would do. A. Pray what is that lity of Body or Matter? you call Figurabi B. That Of Solidity and the Figure of Bodies. 47 B. That univerfal Difpofition thereof, whereby 'tis neceffitated to appear in, or put on fome Sort of Shape, or Figure, or other. A. Wherein doth the Shape or Figure of Matter confift? B. In the Manner, or Mode, or Fashion, of its Extremities, or external Superficies, within which it is contained. A. Is it not the fame with what is call'd the Form and Modification of Matter? B. Yes; and fince the Forms of Matter are only the Shape, or Fathion, of its terminating Extremities, we must exclude fubftantial Forms, as the contradictious Nonfenfe and Jargon of the Schools. A. Doth this Property of Matter you now discourse of, equally relate to the original primogenial Particles of Matter, as well as to the groffer Composition thereof in natural Bodies? B. Yes; but in those inconceiveable Particles of Matter, the Forms, no doubt, are much more fimple, regular, and determinate, than in thofe heterogeneous Compo fitions which we are acquainted withal. CHAP. CHA P. V. Of Mobility of Matter, and the Nature of Motion and Reft. RAY what is meant by the Mobility of Matter? B. It is that effential Property, whereby any Part of Matter is capable of Motion, or being moved. A. What is Motion? B. A continual and fucceffive Change of Place. A. What is Reft? B. The Continuance of a Body in the fame Place, for any Time. A. What is the Cause of Motion? B. An external Force or Power applied to any Body; which being fuperior to its Refiftance, impelleth or driveth it out of its Place. A. How is Motion diftinguished? B. Into abfolute and relative. A. What is abfolute Motion? B. The real Motion of a Body, from one Part of abfolute Space to another. A. What |