Chemistry and Physies. 389 
eg i 
called geological time, shown to be on purely geological grounds 
_4n_ the memoir from which the preceding paragraph is quoted, 
Sir William maintains that an increase in the amount of heat con- 
regions by a submergence of the cireumpolar land, whereas I 
attribute it to certain agencies brought into operation by an 
e result is that all the great equatorial waters of the ocean are 
* This has been proved to be the case by Professor Haughton, in his paper to 
the Royal Society ; “Nature,” July 4, 1878:-—s. ¢. 
