oo 
Lea. I. The (aufes of Mixture. 
229 
CHAP. IV, 
Ofthe C AUSES of Mixture. 
OW all the Canfès of Mixture we can conceive of, 
muft, I think, be reduced to thefe fix in general 5 
vit. Congruity, Weight, Compreffion, Solution, Di- 
‚gefiion, and Agitation, 
1. $. Congruity, or aptitudeand re/pondence be- 
twixt the Sizes and Figures of Parts to be mixed : 
TR whereby Bodies may be truly called the Infirumen- 
talCanfes of their own Mixture. As when a Plain anfwers to a Plain, 
a Square to a Square, a Convex to a Concave, or a Lefs to a Greater or 
an Égua, &c. according to which Refpondencies in the parts of Bodies, 
they are more or leís ealily mingleable. 
2. $. Weight, by means whereof all Fluid Bodies, upon fuppofi- 
tion of theCongruity of their parts, muft nnavoidably mingle. 
3. $. Compreffion s which either by the Air, or any other Body, 
added to Weight, muft, in fome degree, further Mixture. Becaufe, that 
Weight it felf, is but Prejfion. For.farther Proof of all the faid Can- 
fer, I made this Experiment 3: Let.Oyle of Arifeeds, and Oyl of Vitriol 
be put apart into the Receiver of an Air-Pump. And, having exhan/ted 
it ofthe Air, let the two faid Oyls be then affuféd one upon the other. 
Whereupon, Firft, It is vifible, that they here mix and coagulate to- 
gether; that is, their parts are wedged and intruded one into another, 
without the ufal compreffion of the Air; for that is exhaufled, and 
therefore only by the Cozgruity of their receiving and intruding parts; 
and by their Weight; by which alone they are fo compreffed, as to make 
that Intrufion. Secondly, Ir isalfoevident, That although they do Co- 
agulatez yet not altogether fo much, as when poured together in the 
fame manner, and quantity, in the opex Air. Wherefore, Compreffion, 
whether madeby the Air, or any thingelfe, as it doth further the 
Diffolution of fome Bodies, fo the Mixture of others, and the greater 
the Compreffion, the more. 
4. $. Solutions For all Bodies: mix beft, in Forma finida. And 
that for two reafons. Fir/t, Becaufe the parts of a Body are not then 
in aflate of Union, but of Separation; and therefore, in a more capa- 
ble flate, for their Mixture and Union with the parts of another Body. 
+ Secondly, becaufe then they are alfo ina flate of Motion, more or lel; 
and therefore, ina continual tendency towards Mixture; all Mixture 
being made by Motion. Wherefore all Generations, and moft perfect 
Mixturesio Nature, are made by Fluids; whether Avimal, Vegetable, 
or Mineral. Which is alfo agreeable to the Doéfrine of the Honourable 
Mr. Boyle, in his Excellent Treatife of the Nature and Vertues of Gems. 
And it is well known, That Bodies are ordinarily petrified, or Stones 
made, out of Water.That isout of petrifying parts diflolved per minima 
in Water,as both their Menftruum and their Vehicle. Wherefore, if we 
will talk of making Gold; it muft not be by the Philofophers Stove, but 
by the Philofophers Liquor. 
5-§. Di 
