134 RAMBLES OF A NATUKAL1ST. 



liquefying the hardest rocks. It would be necessary 

 to multiply the upward pressure resulting from these 

 combined forces, not merely by the surface of the 

 crater, but by the extent of the base, which may 

 perhaps embrace the entire central elevation, and we 

 should then obtain numbers representing a force of 

 which nothing would be able to give us any adequate 

 idea, if the mountain itself did not exist as a monu- 

 ment of this formidable power. 



