ANNOTATIONS AND ADDITIONS. 131 



In the column of temperatures in the preceding table the 

 first number 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 deno- 

 minator 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 the processes of vegetation. Dove 

 remarks generally, that the summer temperature of America 

 is lower under equal degrees of latitude than that of Europe : 

 (Temperatur tafeln nebst Bemerkungeu iiber die Yerbreitung 

 der Warme 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--, 

 or 12^ more to the south; in like manner we find the 

 climate of Konigsberg, (lat. 54 43'), at Halifax, (lat. 

 44 39'). The temperature of Toulouse, (lat. 43 36') 

 corresponds to that of Washington (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 : 1, the Atlantic States east of 

 the AUeghanies ; 2, the Western States in the wide basin 

 between the Alleghanies and the Rocky Mountains, through 

 which flow the Mississipi, the Ohio, the Arkansas, and the 

 Missouri ; 3, the high plains between the Rocky Mountains, 



