APPENDIX. 277 



trees are not equal to the height of a man, 

 is 2000 feet below the line of perpetual 

 snow. This zone is therefore much wider 

 than the preceding. Long before its ter- 

 mination Alnus mcana, Frunus Padus, 

 and Populus tremula, were no more to be 

 seen. A little before the Birch ceases, we 

 miss the Sorbiis Aucuparia (Pyrus Aiicu- 

 paria, Fl. Brit.) which for some time had 

 not presented us with any fruit ; the Riibtis 

 arcticus already likewise barren ; Erica 

 vulgaris, Accmitmn It/coctomim, &c. Where 

 the Birch forest becomes thinner, the re- 

 flection of the heat from the sides of the 

 mountains is the strongest. Here in many 

 spots we find the vegetation of Sojichus 

 alpinus, Striithioptcris, and Aconitum ly- 

 coctonum remarkably luxuriant. The drier 

 spots now become covered with Lichen 

 rangiferinus. Tussilago frigida and Pe- 

 dicularis Sceptrum-Carolinum have their 

 place to the utmost boundary of the Birch. 

 Thus far only Charx {Salmo alpinus) is 



