on the Geography of Plants. 



263 



different climates. To render this comparison more complete, 

 we may now add to this table the observations of M. Wahlen- 

 berg in the Carpathian Alps *. I am also enabled, through the 

 kindness of a friend, to present a similar view of the Norwe- 

 gian chain, from 60° to 61° of latitude. The following are 

 the relations in these two countries : 



Snow-line 



Distance of the limit of trees 



from the snow line 



Height of the limit of trees .... 

 Trees which this limit presents 



Limit of shrubs 



Shrubs which this limit presentsf 



Distance of the limit of corn") 

 from the snow-line j 



I propose now to make a few observations upon the table. 

 The annual mean temperature, the temperature of winter, and 

 the temperature of August, assigned to the more elevated 

 regions of Switzerland and Lapland, are most probably cal- 

 culated, according to the generally-received decrement of tem- 

 perature. But if this be correct for Switzerland, it is never- 

 theless doubtful, whether, while observations are wanting, the 

 same laws prevail in Lapland. Besides, when the limit of 

 Betula alba is placed at 250 toises above the sea, and the 

 distance of this limit from the snow-line at 300 toises, there is 

 evidently in this place an error of the press ; for, in the Flora 



• Flora Carpathorum. 



t The author employs the Rhododendra in his comparison ; without spe- 

 cifying any either in the Carpathian Alps or in the above-mentioned part of 

 Norway. But since the limit of Betula nana and Salix Glaucaf is not much 

 lower in Lapland than that of Rhododrendron Lapponicum^ and according to 

 Wahlenberg's view, Pinus Mughus in the Carpatliian Alps, stands in com- 

 parison with Salix glauca in Lapland, and Alnus viridis in Switzerland, I 

 have chosen the above plants. I will not deny, however, that the parallel 

 is not perfectly accurate. 



