458 Scientific Intelligence. 
go back for many millions of years we reach a period when the 
earth must have been rotating much faster than now. Sir Wil- 
tidal-wave, that the sea-level must be slowly sinking at the equa- 
tor, and rising at the poles. This, of course, tends to protect the. 
polar regions, and expose equatorial regions to subaerial denuda- 
ti 
greater than in the temperate regions. n shown In the 
papers above referred to that the rate at which a country is being 
lowered by subaerial denudation, is main rmined, not 80 
