94 Of the FLEXIBILITY &c 



them. While, therefore, the flexibility of thofe ft ratified bo* 

 dies is confidered as arifing from a certain mechanical conftruc- 

 tion, in which flexible plates of talc or mica are united with 

 the granulated body of the ftone, it is of no confequence of 

 what fubliance the rigid particles of the ftone flia.ll coniift, fince 

 they do not alter their form during the flexure, but only move 

 in relation to each other. 



IV. 



