£>octttne of dftualt'tr*** 5 



could never find that they were a- 

 greed upon any certain Definitions 

 or fetled Notions} not onely diffe- 

 ring Authors, but not unfrequently 

 one and the fame ? and perhaps in the 

 fame Brook, employing them in ve- 

 ry differing fenfes. But I will not give 

 the Chymifts any rife to pretend, that 

 the chief fault that I find with their 

 Hypothefis is but verbal 5 though 

 that it felf may not a little blemiftl 

 any Hypothefis one of the firft of 

 whofe Requifites ought to be Clear- 

 nefs^ and therefore I (hall now ad- 

 vance and take notice of defe&s that 

 are manifeftly of another kind. 



And firft t he Doftrine that all thehr 

 Theory is grounded on, feemstome 

 Inevident and undemonftrated y not 

 to fay precarious. It is fomewhat 

 ftrange to me, that neither the Spa- 

 gyrifts themselves., nor yet their Ad- 

 verfaries, fhould have taken notice^ 

 that Chymifts have rather fuppofed 

 than evinced, that the Analyfis of bo* 

 dies by fire 5 or even that at leaft fome 

 Analyp is the ooely inftrument of in* 

 A 3 veftiga- 



