al 
MicrocRAPHras 1 
Spirits; feveral Chymical Oils, which aremuch of kin ‘to thofe Spirits, &¢i 
Others yet require a greater, as water, and fo others #uch greater for als 
moftinfinite degrees: For, I fuppofe there are very few bodies‘ in the 
world that may not be made alquatenus fluid, by fomeor other degree of 
agitation or heat. 3 WLIO ¢ SVS. DES NRSERE 
_ Having therefore in fhort fet downmy Notion of a Fluid. body; [come 
in the next place to confider what Congruity is; and this, as Laid before; 
being a Relative property of a fluid, whereby it may be faid to be Like or 
. aulike to this or that other body, whereby it does or does.xotwmix with 
this or that body. Wewillagainhave recourfe to our former:Experi+ 
ment, though but arude one; and here if we mix in the dith/éveral kinds 
| of fands, fome of bigger, others of Jes and finer bulks, we fhalbfind that 
| by the agitation the fixe fand will eye and throw ont of it felf all thofe 
bigger bulks of {mall ffoves and the like, and thofe will be gathered toge+ 
ther all into owe place 5 and if there be.other bodies in it of other natures; 
thofe alfo will be /eparated into a place by themfelves, and uted or tum- 
bledup together. And thoughthis donot come upto the higheft proper 
ty of Congruity, whichis a Cobefiox of the parts of the fluid together; “or 
a kind of attraéfion and tenacity, yet this does as ‘twere fhadow it out, 
and fomewhat refemble it; for juft after the famemanner, ‘I fuppofe 
the pulfe of heat to agitate the {mall parcels of matter, and thofe ‘that are 
of a like bignefs, and figure, and matter, will hold, or dance together, atid 
thofe which are of a differing kind will be thruft or fhov'd out frombe-. 
tween them; for Sid tonic ae are all fmilar, will, like fo many equal 
mufical firings equally firetcht, vibrate together in a kind of re std 
unifon whereas others that are diffim#lar, upon what account foever,un- 
lefs the difproportion be otherwife count Ballanc’d, will, like fo many ° 
ftrings ont of tune to thofe unifons, though they have the fame-agitating 
pulfe, yet make quite differing kinds of vibrations and repercuffions, fo that 
though they may be both mov'd,yet are their asbrations fo different, and 
fo untund, as ‘twere to each other, that they crofs.and jar againft each 
other, and confequently, canwot agree together, but fy back from: each 
other to their fimilar particles. Now, to give you an inftance how the 
di[proportion of tome bodiesin one refpect, may be connter-ballane’d by 
a contrary difproportion of the fame body in another refpect, whence we 
find that the fubtil vivous fpirit is congrnons, or does readily mix with wa- 
ter, which in many properties is of avery differing mature, we may. cor 
fider that a union may be made either by two ffrizgs of the fame bignefs, 
length, and tenfion, or by two ftrings of the fame bignef, but of differing 
length, and a contrary differing sake 3 OF 3/y. by two ip of anequal 
length and bignefs, and of a differmg tenfion, or of equal length, and diffe~ 
ring bigne[s and tenfion, and \evetal other fuch varieties. To whichthre 
properties in firings, willcorrefpond three proprieties alfo in fandy or the | 
particles of bodies, their Adatter or Subftance, their Figure or Shape, and 
their Body or Bulk, And from the varieties of thefe three, mayarile in- 
finite varieties in fluid bodies, though all agitated by the fame pale oroi- 
brative motion. And there may be asmany ways of making Harmonies 
| . and 
Pe ee ee ee ee a eta ee 
