ANNOTATIONS AND ADDITIONS. 



115 



In the column of temperatures in the preceding table the first num- 

 ber represents the temperature of the year ; that which stands in 

 place of a numerator the mean winter temperature ; and that which 

 stands in the place of a denominator the mean summer temperature. 

 Besides the great difference of .mean annual temperature, there is 

 also a striking difference between the two coasts in respect to the 

 distribution of that temperature into the different seasons of the 

 year, and it is this distribution which is most influential both on our 

 feelings and on T;he processes of vegetation. Dove remarks gene- 

 rally, that the summer temperature of America is lower under equal 

 degrees of latitude than that of Europe (Temperatur tafeln- nebst 

 Bemerkungen iiber die Verbreitung der War-me auf der Oberflache 

 der Erde, 1848 ? s. 95). The climate of St. Petersburgh (or to 

 speak more correctly, the mean annual temperature of that city 

 which is in lat. 59 56'), is found on the East coast of America, in 

 lat. 47 J, or 12^ more to the south; in like manner we find the 

 climate ofKonigsberg (lat. 54 43'), at Halifax (lat. 44 39'). The 

 temperature of Toulouse (lat. 43 36') corresponds to that of Wash- 

 ington (lat. 38 53')- 



It would be very hazardous to lay down any- general statements 

 respecting the temperature in the territory of the United States of 

 America, as we must distinguish in that territory three regions : 



