2G8 



THE BOTTOM OF THE SEA. 



fasliioii attributed to the giants in tlie fable when 

 seeking to scale the heavens. These works are 

 now effected with less precipitation and infinitely- 

 more studied circumspection; enormous blocks are 

 built one upon another, upon which the sea raav 

 exercise its utmost fury in vain. These blocks an^ 



Fig. 60. — Siuking Blocks of artificial Stone at Cheibouig. 



manufactured on the spot, by filling enormous rec- 

 tangular caissons with a kind of coarse concrete, 

 which liardens by contact with the air, and par- 

 ticularly with water (fig. 50). 



