681 



As regards the rest of Ihe species they mav be distributed as 

 follows: - Such as exclusively or mosliv occur on the highesl 

 mountaiii tops, at lcast 7%; these are presumably the oldest in- 

 habitants of tlie islands. Of coast piants. there are 7%; they 

 have doubtless immigrated in pari by the agency of currents, and 

 at very different periods during successive ages. The rest oi' the 

 species, some 46%, occur mostly in the low-lands, l)nt extend 

 also more or less from thence up the mountains. They also have 

 doubtless immigrated al very different periods, and by various means 

 and ways, regarding which nothing is known for certain. 



Taking every thing into consideration, I am fully eonvineed 

 that the whole of the flora — at least all the more highly or- 

 ganized land-plants — have immigrated after the glacial pe- 

 riod, across the sea, and from the nearest countrics, 

 lying east, especially Great Britain. 





