THE PACIFIC OCEAN. 



269 



However, it is quite probable, that there might have 

 been clefts in the ceiling, which might admit air 

 without admitting light; although Mr. Mariner could 

 discover none, even by swimming up each of the 

 chambers with the torch in his hand. He, however, 

 bears testimony, expressly, to the purity of the air 

 durintj his "sdsit to the retreat, so that we will not 

 reject the narrative on that account. 



VOLCANIC ISLANDS. 



The islands of the third class differ greatly in 

 appearance and structure from those of either of 

 the preceding. Abundant traces of their volcanic 

 origin show that they have been elevated from the 

 bed of the Ocean by the resistless energy of fire, 

 which has given a bold and irregular form to their 

 rocky mountains that greatly increases the romantic 



T 



