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pies, fome others 5 coming in his way , that acquaint us with 
feme luc\kvons phammevd. 
And that the Reader may the lefs nuftake what is driven at in 
many of the Experiments and Reafonings delivered and propofed 
in thefe Noces &houtFarticuUr ^udittia ^ hcacquams him, that 
he hath taken upon him to deroonftratc , that the Qualities of Bo- 
dies C4»»(>/ proceed from any other Caufes but Mecbauicd^ but 
preceodsokily to prove, that they be explicated by them, 
fince what he needs to evince,. is , notthat the Mechanical Princir 
plesaretheneceflTary and only things whereby Qualifies may be 
exp'ained , but that probably they will be found fufficitnt for 
their explication; The making outof which, asQiewsrhe infuffi* 
ciencyofthe Perip^ttetic awd Chymicd Theories of Qualities, 
fo it recommends the Corpt^fiuUrian Doftrine o\ them. 
Now, as to the Experiments and inftances here imployed in 
treatiRg of Origin of Qualities , they are of/Ar^^ diftinft forts* 
Somearebroughtrofte w, that the propofed Quality may beMe- 
c\\z\\\cz\\y introduced into a portion of mailer where it was not 
before ; Others , that by the fame means the Qualify may be no. 
•tably ^-^r/V^ as CO Degrees^ or othernot Efftntial attributes: O- 
thers laftly , that the Quality is MecJhanically Expelled from , or 
aholiflid in a portion of matter that was endow 'd with it beforc;and 
^ new one produced by the fameoperation* That tht firjl fort of 
Kindsoflnftancesmay be ufcfully employed intbis Subjeft, hath 
no difficuicy. As to the Second , Since the permanent Degrees as 
well as other Attributes of Qualities are faid ta flow from , and do 
indeed depend upon , th« fame Principles tha^: the Quality iifelf 
does , ifefpecially in Ecdies Inanimat a change barely Mechani- 
cal doesnorably and permanently alter the ^fgr^^ or other confide- 
rable attribute ; it will afford, though not a clear proof, jet a 
probable prefumption that thePrirxipIes w hereon the Quality itfelf 
depends, are Mechanical, Jgain^ if by a bare Mechanix:al 
change of the Internal difpofition and Struflureofa Body , a per- 
menent Quality , confefled to flow from its Subjlmtial Form or 
Inward principle, be aholi/hed^ and perhaps aifo immediately 
fucceeded by a new Qaality Mechanically producible ; if, I fay, 
this come to pafs in a Body Inajiimat, efpecially if it be alfo,as 
to fenfe, Similar, fuch a Phenomenon will not a little favour that 
H/potheJis, which teaches, that thefe Qualities depend upon 
cerrain Contextures and other Mechanical afFeflions ofthe fmall 
partsof the Bodies that areindow'd withthems and confequenily 
that 
