04 : Of the FLEXIBILITY, &e. 
them. While, therefore, the flexibility of thofe ftratified 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 fubftance the rigid particles of the ftone {hall confift, fince 
they do not alter their form during the flexure, but only move 
in relation to each other. : 
IV. 
