which end, thedigefting my thoughts into 

 order, and the fetting them downe in wri- 

 ting, was neceflary : for without fuch ftrift 

 examination of them, as the penning them, 

 affordeth onemeanes to make s they would 

 hardly have avoyded being disjoynted and 

 roving ones. Now that I have done that, 

 my next ayme is that you, unto whom I wifh 

 as mucfy good as unto my felfe, may reap as 

 much benefit by the ftudying it, as I have 

 done by the compofing it. 



My end then being a private one, as (loo- 

 king no further then you my fonne, and my 

 felfe) I have not endeavoured to exprefle my 

 conceptions either in the phrafe,or in the lan- 

 guage of the Schooles. It will ferve our 

 turne, to comprehend the fubftance, without 

 confining our felves to any fcrupulous exacl- 

 neffe, in what concerned* onely forme. And 

 the fame confideration hath made me paffe 

 {lightly over many particulars , in my firft 

 Treatife of the Nature of Bodies^ upon which 

 learned and witty men might (pin out large 

 Volumes. For in that part, I ayme no fur- 

 ther, then to (hew what may be effected by 

 corporeall agents. There, pofsibility ferveth 



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