POSSIBLE REVERSAL OF DEEP-SEA CIRCULATION 373 



their temperatures until they rose to the surface in the polar regions 

 and gave their warmth to the atmosphere. Aided by the enshroud- 

 ing mantle of vapors that must have arisen from such a body of 

 water, it is conceived that the mild temperatures requisite for the 

 maintenance of the recorded life through the polar night may have 

 been thus maintained. 



If this be granted, however, it is wise to note that this is not a 

 radical solution of the climatic problem, for a fundamental cause 

 for the conditions that brought on freezing at one period and pre- 

 vented it at others is prerequisite to the postulated influence of these 

 in the reversal of the abysmal circulation. At the best, our sugges- 

 tion offers only an auxiliary agency in the control of secular chmates. 

 Some more fundamental agency or agencies must be sought. 



