VI MOUNTAINS 247 



always been found that the seat of disturb- 

 ance must have been within 30 geographical 

 miles of the surface. 



Yet, though we cannot connect volcanic 

 action with the central heat of the earth, 

 but must regard it as a minor and local 

 manifestation of force, volcanoes still remain 

 among the grandest, most awful, and at the 

 same time most magnificent spectacles which 

 the earth can afford. 



