119 



CHAP. VII!. 



ON THE INTERNAL STRUCTURE OF ROCKS. 



THE following modifications include the different 

 varieties of structure that are found in rocks. 



LAMINAR: Including the foliated and the 

 schistose. 



This term requires no further explanation ; 

 except to remark that, although it may in some 

 cases coincide with the stratified disposition, it 

 possesses no necessary connection with that. It 

 occurs under three modifications, which may be 

 conveniently distinguished into the lamellar, the 

 foliated, and the schistose. 



In the lamellar modification of this structure, 

 a rock is found to divide with more or less faci- 

 lity, either by the application of force, or from the 



