DOMAIN VI. CARBONACEOUS. 54S 



of rocks, any refined discrimination would 

 appear unnecessary. It has already been 

 more than once observed that the division 

 of mineralogy into three quite distinct and 

 separate provinces, METALLOGY, LITHO- 

 LOGY, and TETRALOGY, would be of the 

 utmost importance to the progress, illustra- 

 tion, and utility of the science ; each of 

 them being amply sufficient for the life and 

 labours of one man ; and, in this case, the 

 subjects under view could not be allotted 

 to any other grand division. 





