168 



DALY. 



British Columbia, and the Cascade Range of Washington and Oregon. 

 For such regions the free air of Glacial times seems to have been from 

 6° to 10° C. colder than now. Hann computed the minimum lowering 

 for Spain to be 4.5° C.-^^ David estimated a similar lowering for New 

 South Wales at not less than 5° C.^'^ 



The mean annual temperature, and the mean monthly temperatures 

 of the surface water of the open ocean are almost identical with those 

 respectively belonging to the overlying air. Hence the tropical seas, 

 at the time of maximum Pleistocene glaciation, probably had an aver- 

 age temperature of at least 5° C, and possibly as much as 10° C, 

 below their present mean annual temperature. 



This result may now be confronted with the data of the following 

 table, compiled from the atlases of the Deutsche Seewarte (Atlantischer 

 Ozean, 1902; Indischer Ozean, 1891; Stiller Ozean, 1893). It gives 

 the present mean monthly temperatures of principal parts of the coral 

 seas. 



Temperatures in the Coral Seas, in degrees Centigrade. 



