ARCTIC PLANT GEOGRAPHY 153 



be made with alpine plants into the Arctic and with arctic plants into 

 alpine regions. These experiments would discover the effect of the 

 environmental conditions and would make clear the affinities of 

 closely related species, which are considered to be mere geographical 

 forms, such as alpine plants which have migrated to the Arctic Regions, 

 and vice versa, and which are regarded systematically as geographical 

 forms of a common type. 



