ee al a i 
Led. I. The (aufes of Mixture. 229 
CG HeAks TV 
Of the C AUSES of Mixture. 
ZO W all the Caujés of Mixture we can conceive of, 
Zp mutt, I think, be reduced to thefe fix in general 5 
9 viz. Congruity, Weight, Comprelfion, Solution, Di- 
geftion, and Agitation. 
I. §. Congruity, or aptitudeand refpondence be- 
twixt the Sizes and Figares of Parts to be mixed : 
asec whereby Bodies may be truly called the In/frumen- 
tal Canfes of their own Mixture. As when a Plain anfwers to a Plain, 
a Square to a Square, a Convex toa Concave, or a Lefs toa Greater of 
an Equal, &c. according to which Re/powdencies in the parts of Bodies, 
they are more or lef eafily wingleable. 
2. §. Weight, by means whereof all Fluid Bodies, upon fuppofi- 
tion of theCongruity of their parts, muft nnavoidably mingle. 
3. §. Compreffioe 3 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 Preffioz. For further Proof of all the faid Cau- 
fes, Imade this Experiment ; Let Oyle of Anifeeds, and Oy! of Vitriol 
be put apart into the Receiver of an Air-Pump. And, having exhanfled 
it of the Ar, let the two faid Oylsbe then affufed one upon the other. 
Whereupon, Firff, It is vifible, that they here mix and coagulate to- 
gether; that is, their parts are wedged and intruded one into another , 
without the afzal compreffion of the Air; for that is exhauffed, and 
therefore only by the €oxgruity of their receiving and intruding parts 5 
and by their Weight ; by which alone they are fo compreffed, as to make 
that Intrufion. Secondly, It isalfoevident, That although they do Co- 
agulate;, yet not altogether fo much, as when poured together in the 
fame manner, and quantity, in the open Air. Wherefore, Compre(fiox, 
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. §. Solution; For all Bodies mix beft, in Forma fluida. And 
that for two reafons. Firff, Becaufe the parts of a Body are not then 
in a flate of Uxion, but of Separation; and therefore, in a mote capa« 
ble ffate, fortheir Mixture and Unxion with the parts of another Body. 
Secondly, becaufe then they are alfo ina ftate of Motion; miore or lefs5 
and therefore, ina continual tendency towards Mixtures all Mixture 
being made by Motion. Wherefore all Generations, and oft perfect 
Mixiuresin Nature, are made by Fluids whether Avimal, Vegetable, 
or Mizeral. Which is alfo agreeable to the Doérine of the Honourable 
Mr. Boyle, in his Excellent Treatife of the Nature and Vertues of Gers. 
And it is well known, That Bodies are ordinarily petrified, or Stones 
made, out of Water.That issout of petrifying parts diflolved per minimd 
in Water,as both their Menftruum and their Vehicle. Wherefore, if wé 
will talk of aking Gold; it muft not be by the Philofophers Stove, but 
by the Philofophers Liquor. pe 
56 §. Dis 































































