I HE STORY OK THE EARTH. 



By the conver- 



i upon its 



s into heat, at a depth from the surf; 

 e that the heat so gei 



■ 

 ice of the globe. 



its surface ha\ 



u ay different from what it is i 



St depth at which the fractures and 



arthquak known by 



isurement to originate, is about 30 



been calculated that a I 

 • e might occur at a depth 



10 or 30 miles. This is the maximum depth to 

 extends us inferen< 



•^ have hern made to < the 



■ under which masses of granite in moun- 

 tain chains have Consolidated. In soi: i the 



to indii Mipcrin- 



ibent pr< qua] to no more than 15 miles' 



thi< k, though I was proba- 



bly lateral. 



e no 

 indi< I from more than 



depths. The molten in. 



iquid l 



wine h 1 the 



- PS the hi 



s surface, w hi< his 



-. with 



e to 



