Le&.1 Of Mixture. The Principles, &e. 
223 
$. 6. I (hall therefore endeavour to open the true Nature of Mixture. 
And 1 fhall build my. Dorine upon the Common Notions of Senfe: 
which none can deny; and every one may conceive of. In order to 
which, I (hall take leaveto lay down fome Propofitions, of the Princi- 
ples of all mixed Bodies. 
CHT ARATI 
Of the Principles of Bodies. 
ND firk, by Principles, I mean Atomes, or certain 
Sorts of Atomes, or of the ‚fimpleft of Bodies. For 
otherwife they would not be Principles; for a 
compounded Principle, in ftriCt fpeaking, is a Con: 
tradition, Even as Fives, Threes, or Two's are 
not the Principles of Number, but Unites. 
SS 2. $. Whence, fecondly, it follows, that they 
are alfo Indivifíble. Not Mathematically ; for the Atomes of every Prin- 
ciple have their Dimenfions. But Phyfically 5 and fo, what is but one, 
cannot be made two.  Ifit beasked, Whether aStick cut with a Knife, 
be not of one, made two? I fay, that a Stick, is not oxe Body, but 
many millions of Bodies; that is, of Atomes; not any one whereof is 
divided within it felf, but only they are feparated one from another, 
where the Knife forceth its way. As in the drawing of a mans Finger 
through a Heap of Corn; there is no Divifion made in any one 
Grain, but only a feparation of them one from another, all remaining 
ftill in themfelves entire. I fay, therefore, that what is Phyfically 
one, is alfo moft firm, and Indivifible, that is, Impenetrable : for Penetration 
is but the Separation, not the Divifion of Atomes. 
3. $. Hence, thirdly, they are alfo Immutable. For that which 
cannot be divided, cannot be chang’d. So that of the whole World 
of Atomes, not any one hath ever fuffer'd, or can fuffer the leaft mn: 
tation. Hereupon is grounded the Conftancy of Caufes and Effe&s. So 
that, in all Geverations, itis not leß certain, that the felf fame Prin- 
iz » ciple is (till propagated from the fame; than, that Max is from Man; 
Wherefore, compounded Bodies are generated 5 but Principles are not, 
but only propagated 5 that is, in every Generation, they pafs, in them- 
felves unaltered, from one Body, into another. 
4. $. IF Principles, or Atomes are all Immutable , it again follows > 
That they are of Divers Kinds. For one and the fame Principle, or Kind 
of Atomes, will ftill make the Same Thing, and have the fame Effe& : fö 
that all Generations would then be the Same, Wherefore, fince they 
are Immintable, they muft be Divers. 
5. $. This Diverfity, for the fame reafon, is notímall, but very 
Numerons. For as the World, taken together, is Natures Shop; fo the 
Principles of Things are her Tools, and her Materials. Wherefore, as 
it fpeaks the goodne/s of a Shop 5 fo the Perfedtionof the Universe, That it 
isfurnifhed with many Tools wherewith,and many Materials whereupon 
to work. And confequently, that Philofophy beareth beft its own names 
which doth not ftrain all totwo or three Principles; ike two or three 
Bells 
