for all the Sands that could be contained in the Earth, will require a Sum of not less than 32 Figures, the firft of which is a (3,) and the whole too long to be expreffed here.

Now in Sect. XVI, the Number there found was 44 Figures, of which the first was a (4.)

Now let us for Conveniency, and to prevent any Difputes, fuppofe that both the first Figures were a (1,) and the reft Cyphers or Noughts, by which we lose an unconceivable Number of Parts: Accordingly the Sands of the whole Earth will be 101.

And the Particles of Light flying out of a Candle in a Second 10.

The Proportion of the one to the other, will be As 1 To 10', or As one To a thousand times a thousand Millions.

I

From whence it may be concluded, that in one Second (which is commonly equal to one Pulfe of a healthy Man) there fly out of a burning Candle of Six to the Pound, many more Particles of Light than a thousand times a thousand Millions of that Sand the Number the Earth can contain, or be equal to.

I leave every one to confider, whether this does not appear most amazing to him, and whether he is not bewilder'd, and lofes himself in the Number and Smallness of thefe Particles of Light, tho' there were no more of 'em; whereas every one may perceive from what has been faid, that if we had kept to a ftrict Calculation, the Number thereof would very far, yea unconceivably, furpaís what we have here fet down.

SECT.

SECT. XVIII. The Smallness of Parts in folid Bodies, Juch as Copper or Brass, &c.

LET us now pafs on to folid Bodies (tho' the Divifion of this Tallow may likewife be ferviceable to the fame Purpose) and endeavour to fhew, First, That they confift of a vaft Number of different Particles. Some of the most intelligible Methods feem among others to be the following. 1. Mr. Boyle (de Subtil. Effluv.) fays, that a Grain of Copper having been diffolved by him in Spirit of Sal Armoniac, did thereby communicate a vifible blew Colour to 28,434 Grains of Water.

Now if we fuppofe that each Grain of Water was impregnated with one Particle of Copper, it will follow from thence, that one Grain of Copper was divided at least into fo many Parts as there were Grains of Water.

I

But fuppofing with Mr. Boyle, that of an Inch in Length is vifible, ... of a Cubical Inch will be likewise visible.

100,000

And fince one Foot of Water of 64 Pounds (allowing 12 Inches to the Length of one Foot) contains 1728 Cubical Inches; the aforefaid 28,534 Grains will amount to above 100 of the faid Inches; and confequently in all thofe Inches there will be more than 100 000,000, or one hundred Millions of vifible Parts; wherefore if there be but one Particle of Copper in every vifible Particle of Water, a Grain of Copper will be thereby really divided into fo many Parts.

SECT.

SECT. XIX. The Smallness of Parts in folid and fluid Matters in general.

Now how far the Parts of Gold may be really extended by human Inftruments, has been fhewn by Robault, Boyle and others.

One Proof which is as applicable to all folid Bodies as well as fluid, may be briefly fhewn in the already-mention'd Experiments of the Microfcopes of Mr. Leuwenhoek; by which it appears, that of those smallest Animalcula which he could fee thro' them 105, or 1,000.000,000.000,000 go to the making up of one Cubical Inch. Now it is certain, that if the Particles of which a Body is compofed are so small, that each of 'em are invifible to the Microscope, every Inch at least of the faid Body must confift of more than 10 of fuch Particles.

From whence then the fame may be truly affirmed of all Metals, Minerals, Animals and Plants, in a word, of every thing that is visible.

And no Body ought to be furpriz'd, if we fhould add, that this Number of Parts is much too fmall to exprefs properly the Multitude thereof; and this may certainly be proved in many Cafes, if it be confider'd ;

Firft, That these fmall Animalcula which are only visible thro' the Microfcope, must be furnifhed likewife with the proper Inftruments for Life, Motion and Procreation, as also with their Juices by which they are nourished; to the smallnefs of which, no Power of human Imagination feems capable of being extended.

Secondly, That almost all Animals and Plants are combuftible, and may be put into a perfec Flame; for which Reason, if we only make a rough Estimate (according to what has been faid

above, Sect. XVI and XVII, of the smallness of the Particles of Light) how much greater the Flame proceeding from them is, than that of a Candle; and confequently, how many more Parts do every Moment fly out of them under the Figure of Light, all which did contribute before to the Structure of fuch a Plant or Animal, fuch a multitude, and fuch a fmallness of Parts will refult from thence, as (to those who do not fee the force of these Confequences) must seem incredible, and unconceivable even to thofe that can see them.

SECT. XX. Experiments fhewing the determinate Properties of these Small Parts.

Now that these numerous Particles which flow from Bodies, are not only very fmall, but have likewise a determinate Nature and Effence, has been fhewn by the Learned Mr. Boyle in a particular Treatife, to which we refer the Reader.

But to fay fomething of the Matter; Glafs of Antimony, as is well known to thofe that underftand the Virtue of it, being infused in Wine, will make a Vomit, tho' the Antimony lofes nothing fenfibly of its Weight; and the Parts of it are fo exceeding small and fine, that an Ounce or lefs would furnish Vomits for more People than are in the whole City of Amfterdam.

From whence appears, not only the fmallness of thofe Parts which it communicates to the Wine, but also that the Nature thereof is determinate.

Gold, Silver, Mercury, it may be other Metals too, being diffolved in their refpective Menftruums, are divided into an infinite Number of invifible Particles; and they may be all precipitated, as the Chymifts phrase it, or caufed to fub

fide

fide in thofe Liquors, and be returned again into their feveral Metals.

How small the Effluvia are that come out of a Loadftone, and which will even pafs thro' Glass to move Iron, is plain enough from fuch an Effect; and withal, that they have their determinate Properties.

SECT. XXI. Of the Smoak of Benjoin.

THEY who defire to see a Calculation of the fmallness of the Particles that exhale from sweet or ftinking Matters, fuch as Musk, Civet, Ambergreale, a Fatida, and the like may meet 'em in Dr. Keil's Introduction, and yet they all retain their particular and determinate Scent: To fay nothing of the Particles which a Hare or other hunted Beafts leave upon their Foot-steps, fince Mr. Boyle has exprefly treated of [the fame, it may be proved from the following Experiment, without any Trouble or Charge, of how many Particles a folid Body confifts.

In a Chamber that was 24 Foot long and broad, and about 16 Foot high, I placed little Pans of Fire in 4 feveral Places, and ftrewed upon each of 'em about of a Drachm of Benjoin ; whereupon, the Chamber, after fome time, was full from one end to the other, of a thin vifible Smoak.

Now the Contents of this Chamber were 9216 Cubical Feet, which being multiply'd by 1000, or the Number of Inches in a Foot (fuppofing it be divided into 10 Parts in Length) amounted to 9.216,000 Inches.

Now of an Inch in Length is visible to the naked Eye, (Sect. IV.) confequently then ...... of a Cubical Inch; fo that there being 1.000,000 vifible Particles in an Inch, there were