TRANSACTIONS 



llatitral Pbtorn Snmtn of #lasg0fe. 



An (Ecologrical Problem. 



By Peter Ewing, F.L.S. 



[Read 27th September, 1904.] 



As something is expected from the President at the opening of the 

 session, I wish to ask your attention for a short time to one of 

 those oecological problems which are now exciting the curiosity 

 of botanists, namely, the relation between alpine plants and the 

 rocks on which we find them. 



We talk of plants being found on the mountain limestone, on 

 the trap rocks, on the granite, and on the schists. The question 

 we wish to discuss is this, ■' Are any of the plants we term alpine 

 confined to any one of these formations ? " That involves our first 

 agreeing as to what are alpine plants. For the present we will 

 include what may be termed arctic species along with the alpine 

 species, only remarking that we have a fairly large number of so- 

 called arctic species in Scotland. 



LIST OF THE SPECIES. 



