100 THB ORIGIN OP CREATION. 



and repressed, by the enormous pressure." "But let the 

 pressure be relieved, and they make their way to the surface, 

 expanding as they rise, till they burst in great power." 



This admission shows how necessary it is for every man of 

 science to beware of taking any doctrine for granted, unless they 

 have sifted it in every particular, and made it stand the test of 

 tijeir own observations, experiments, and calculations ; for it is 

 evident that had Herschell allowed his own common sense to 

 guide him, he would probably have discovered, and caused to be 

 atteepted long ago, the true explanation of volcanoes and 1 earth- 

 qiiakes. 



