DOMAIN XII. 



VOLCANIC. 



numerous. 



volcanoes xHE volcanic rocks may be said, with the 

 German mineralogists, to be of the most 

 modern formation, as every new eruption 

 of about one hundred and fifty volcanoes 

 scattered over the face of the globe, must 

 produce new rocks of this description. 

 That there are also volcanoes at the bottom 



