To the Reader. 



knowledge Jhould be jirongly tempteS 

 to envy them to the Public^ to the end 

 onely that a few Compilers Jhould not 

 be pit upon Jo reajbnable and ea(ie a 

 wor^ as by u few words or names to 

 Jfoew themf elves juji if not grateful. 



But not to keep the Reader any lon- 

 ger font the perufal of thefe Traffs 

 themfelves^ I JhaU conclude with inti* 

 mating onely 5 that what our Author 

 (kith in one of them concerning the In- 

 liifficiency of the Chymical Hypothe- 

 iis for explaining the Effects ofNature^ 

 is not at all intended by him to dero- 

 gate from the fiber Profejfors of Chj* 

 miflry, or to difcourage them fiom ufe~ 

 ful Chymical Operations 5 forafmuch as 

 4 1 had the fatkfadtion^ fime years (ince^ 

 to fee in the Authors hands a Dijcourje 

 of his about the Ulefulnefs of Chymi- 

 ftry for the Advancement of Natural 

 Philofophy ; with which alfo 'tis ho- 

 ped he will ere long gratifie the Ptb- 



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