or J&oDuttt'on of IFijttnefk 7 



fbmetimes happens^ that the fmooth- 

 nefs and flatnefs of their furfaces 

 makes them fo (tick together, as to 

 refill: a total divulfion 5 as may be 

 illuftrated by what I havefaid of the 

 cohefion of polifhed marbles and the 

 plates of glafs, and by the fixity of 

 glafs it felf in the file* 



From this account of the Caufes or. 

 Requifites of Fixity^ may be dedu- 

 ced the following means of giving or 

 adding Fixation to a body, that was 

 before either Volatile, or left fixt. 

 Thefe means may be reduced to two 

 general Heads 5 F*rfi y the adion of 

 the Fire, as the parts of the body, 

 expofed to it, are thereby made to 

 operate variouily on one another. 

 And next} the aflbciation of the par- 

 ticles of a volatile body with thofe 

 of fome proper additament : Which 

 let m [of proper] I rather imploy than 

 that, one would expedt, [of fixt Q 

 becaufe 'twill ere long appear 9 that, 

 in certain cafes, fome volatile bodies 

 may more conduce to the fixation of 

 other volatile bodies, than fome fixt 

 A 4 ones 



