forfaces, and make them fa broad 

 and fmooth, if not alfo fo fiat, as that 

 the cootaft of the corpufcles ftiall 

 come to be made according to a large 

 portion of their fupcrficies, from 

 whence will naturally follow a firm 

 Cohelion. Which I (hall illuftrate 

 by what we may obferve among thofe 

 that grind glaffes for Telefcopes and 

 Microfcopes. For, thefe Artificers, 

 by long rubbing a piece of glafs a- 

 gainft a metalline Di(h or concave 

 VefTel, do by this attrition at length 

 bring the two bodies to touch one 

 another in fo many parts of their 

 congruous furfaces, that they will 

 ftick firmly to one another, fo as 

 fbmetimes to oblige the Work-man 

 to ufe violence to disjoyn them. 

 And this inftance (which is not the 

 fole I could alleage ) may fuffice to 

 (hew, hqw a Cohelion of corpufcles 

 may be produced by the mutual ad- 

 aptation of their congruous furfa- 

 ces. And if two grofler corpufcles, or 

 a greater number offmaller, be thus 

 brought to ftick together^ you will 



eafily 



