To the Reader. 



Relations. And fome of thefe Impe- 

 diments do yet fupprefi what the Ah- 

 thor intended Jhould have made a part 

 of the Boo^ which now he Juffers to 

 be publijffd without them^ though di- 

 vers of his Papers about fome other 

 particular Qualities have been written 

 fo long ago , as to have lain for many 

 years negle&ed among other of his old 

 Writings : Which that he may have 

 both leafure and health to review ^ and 

 fit for publication^ is the ardent wijh of 

 the (incere Lovers of Real Knowledge^ 

 who have reafon to looh^ on it as no 

 mean proof of his conjlant kindnefs to 

 Experimental Philofophy^ that in thefe 

 Tra&s he perfeveres in his courfe of 

 freely and candidly communicating his 

 Experiments and Objervations to the 

 pMick^, notwithstanding the liberty 

 that hath been too boldly taken to men- 

 tion them as their own by fome later 

 J Vr iters ^ as particularly by the Compi- 

 ler of the Treatife, eniitu'Cd Polygra- 

 phicc, who in two Chapters hath allow d 

 hiwfclf to prefent his Reader with a- 

 love F? fty Experiment s y takgn out of 



our 



