EOECE OF THE "WAVES. 59 



no less than 510 cubic yards in size. It is a piece that the waves 

 have detached from a reef and driven before them across the land.* 

 How can we wonder that waves strong enough to hurl such projec- 

 tiles can alter the shores in such varied ways, demolishing the cliffs 

 here, and forming islands there, or constructing sand-banks at the 

 entrances to gulfs.f 



* Zurcher and Margolle. 

 t See below, the chapters entitled, The Shores and the Islands ; The WorJc of Ifan. 



