156 A NATURALIST ON DESERT ISLANDS. 



It was only from these great piles of isolated and odd- 

 looking rocks, which crown so many of the smoothly- 

 rounded eminences, and have been able by their greater 

 hardness to hold out the longer against the pulverising 

 processes, that we could get any idea of the formation of 

 the island. But on the subject of geology we shall have a 

 few remarks to make in a later chapter. 



