S 8 Mm^ttfymitaWnsinttir 



on Filings of crude Mats , readily 

 and manifeftly fall upon the powder 

 with froth and noife, but Con the con* 

 fcrary } refted for divers hours calm- 

 ly upon it , without fo much as 

 producing with it any fenfible 

 warmth, 



EX PER. IV, 



r T agrees very well with our Do* 

 ftrine about the dependance of 

 the Corrofibility of Bodies upon 

 their Texture, that from divers Bo- 

 dies ^ whilft they are in conjun&ion 

 with others, there refult mafles, and 

 rhofe homogeneous as to fenfe, that 

 are eafily diflbluble in Liquors y in 

 which a great part of the matter, if 

 it were Separated from the refi^ 

 would not be at all diflblved. Thus 

 we fee, that common Vitriol is ea- 

 ftjy didblved in meer water 5 where- 

 as if it be skilfully calcin'd, it will 

 yield fometimes near half its firft 

 weight of infipid Colcothar, which 



not 



