POLAR ICE-CAPS AND SEA LEVELS. 327 



inner globe to be solid but of density less than 

 that of water, say equal to that of cork or wood, 

 then the water would no longer form an envelope 

 enclosing the solid, but would run together, and 



FIG. 2. 



the configuration of solid and liquid would be 

 represented by a section such as Fig. 3. 



Mr. Croll goes on to inquire what would be 

 the probable effect, upon the level of the ocean, of 

 changing the centre of gravity of the earth, if we 

 suppose a quantity of ice (a polar ice-cap) to be 

 transferred to one pole from the other. I shall just 

 say one word as to the attraction of the polar ice- 

 cap. 



