178 



STEATITE. 



In Serpentine. In Limestone. 



Granite: rarely. 



BITUMEN. 



In Shale. In Marie slate. 



Limestone : primary and / n 

 secondary. 



^. .,-,-. y... /. -<,*,,. *,/--> 



PITCHSTONE. 



In Pitchstone ; pearlstone ; porphyritic pitchstone. 



CHERT. 

 In Chert : only. 



It is obvious, that as the conglomerates par- 

 take of the different natures of the rocks of which 

 they are formed, their constituent parts must be 

 separately investigated. 



