NOME XXII. SULPHURIC ROCKS. 





HYPONOME II. 



Sandstone with mineral tar. 



HYPONOME III. 



Mumia or asphalt, in the rock, from Persia, 

 Micronome 1. Bituminous shale. 

 Micronome 2. Marl. 

 Micronome 3. Limestone with caoutchou. 



NOME XXII. SULPHURIC ROCKS. 



The pyritic rocks, as has been already ex- 

 plained, are generally arranged in the respective 

 modes of the substances in which they are found; 

 pyrites being, like mica, of almost universal 

 occurrence, and nowise considered as altering 

 even the structure of the stone. 



Werner has considered sulphur as natural, 

 and volcanic j the latter being found in lava, Or 

 near volcanoes. That found in the other rocks, 

 is here chiefly to be considered : and Mr. Jame- 

 son has well illustrated this subject 



