LIFE ON THE EARTH. 



157 



In the following Table the temperatures accord- 

 ing to latitudes are represented (1) for the whole 

 Northern Hemisphere, (2) for the warmest band of 

 water up the Atlantic 1 , (3) the difference of these or 

 the warming influence exerted by the sea-currents 

 and winds. 



As already observed the temperatures, even in 

 the warm North Atlantic band, are not high enough 

 to suit the case of the Coral growths in Palaeozoic 

 and Mesozoic ages, which demand in lat. 60 about 

 34, in addition to the average temperature, or 18 

 above the highest observed temperature. 



To meet this necessity we may suppose a more 

 effective distribution of the equatorial temperature 

 into the basins of the North. We may further sup- 

 pose, for the sake of calculation, the average result 

 1 From Dove's Maps of Temperature. 



