The Preface. 



recttrre unto hidden andunexphcabtc qualities. And if I have 

 declared fo many ofthefe y as way beget aprobableperfwafion in 

 my reader, that the reft y which I have net touched 5 may like- 

 wife be difylayed y andfhewed to faring out of the fame grounds 5 

 if curious andcenflant fearchers into nature, will make their 

 taske to penetrate into them^ / have therein obtained my defire 

 and intent-^ which is onely ., tofhew front what principles , all 

 kinds of corporeall operations doe proceed-, and what kind of 

 operations allthefe inufi be^ which may iffueottt of thcfe prin- 

 ciples : to the end) that I may from t hence ^ make aflep)o raife 

 my dtfcourfe to the contemplation of thefoule-, and fhew , that 

 ber operations arefuch y as cannot proceed from thofe princi- 

 ples^ which being adequate and common to all bodies', we may 

 refl ajjured, that what cannot iffuefrom them^ cannot have a 

 body fcr itsfottrce. 



I will therefore end this preface^ with entreating my Rea- 

 der to confider, that in a difcourfeproceeding in fuch order as 

 1 have declared he muf not expect to under ft and, and btfaiii - 

 fed^ with what itfaidtn any middle or latter part , unleffe he 

 jirft have read^and under food what goeth before. Wherefore^ 

 if be cannot refelve with himfelfe^ to take it along orderly as 

 it lyethfrom the beginning, he flail dse himfelfe (as well as 

 me) right ^not to meddle at all with this booke. Bat if bee will 

 employ any time upon it jo receive advantage by it fa mufl be 

 content to take thepaines to understand throughly every parti- 

 cular as it is fet downe. And if his memory will not ferve 

 him to carry every one along with him, yet at the leiftjet him 

 be Jure to remember the place where it is handled, and upon oc- 

 cafion } return a look back upoi it, when it may ft and him in 

 flead. if hethinketh this diligence too burthenfom.e 3 let him 

 conpder that the writinghereof hath coft the Authour much 

 more pains : vtlo at hf will efteem them exceedingly well em- 

 ) if they may contribute ought to the content or advan- 

 tage 



