56 



DISTRIBUTION OF PLANTS 











Probable Tem- 









Altitude 



perature of 



Regions. 



Characteristic Species. 





or 



, . A 











Latitude. 



Earth. 



Air. 





Tamarix gallica,ext. to Lat. 



52° 



51° 



50 





r 



Clematis Vitalba - - 



— 



54 



49 



48i 



t/5 





Acer campestre - - 



— 



56 



48 



47f 







(Cornus sanguinea) ? 



— 



58 



47* 



46| 



3 



o 





( Viburnum Opulus) ? 



Alt. 



200 yds. 



46| 



«i 



O^ 



Uplands «■ 



Quercus sessiliflora - 



— 



300 



45f 



44| 



o 





Fraxinus excelsior 



__ 



400 



44| 



43 





Corylus Avellana - 



_ 



500 



44 



41| 



hJ 



Medians < 



Cytisus scoparius 



— 



600 



43£ 



40i 





Genista anglica - 



— 



700 



42f 



39^ 



cfi 



' 



Arbutus Uva Ursi 



— 



800 



41f 



38 



"3 



Subalps - 



Juniperus communis 



— 



900 



40| 



36| 



3 

 O 





Calluna vulgaris 



— 



1000 



40 



35i 



o" 





Azalea procumbens - 



— 



1100 



391 



34i 



_C 





Vaccinium Vitis Idasa 



— 



1200 



38f 



33 



►5 



Alps 



Empetrum nigrum - 



— 



1300 



37-1 



313 



S-H 



Vaccinium Myrtillus 



— 



1400 



86! 



30§ 





Salix herbacea - 



— 



1450 



36 



30 



The altitudes refer more particularly to the Scottish 

 Highlands ; many circumstances tending to prevent ac- 

 curate estimates in England. The natural limits having 

 given way to the limits artificially determined by the 

 agency of man is one obstacle amongst others. Stations 

 for the several species in the upland region will occur in 

 England considerably higher than is indicated above, but 

 the contrary will usually hold true with respect to those 

 higher in the scale. Calluna vulgaris does not attain 

 1000 yds in Cumberland, but rises to nearly 1050 yds 

 on the Cairngorm range. The oak (Winch) rises to 

 nearly 500 yds in Durham, but is not seen so high in 

 Scotland. The heights expressed are rarely or never 

 attained by any of the species in the north and west of 

 the Highlands. Neither, in fact, are we to suppose that 

 nature really presents the regularity of step or stage re- 

 presented in the scale. There is not just 100 yds between 

 the cessation of the Cytisus and Genista, or the Calluna 



