453 X. GENERAL REMARKS. 



species mentioned above ; and their longitudinal limita- 

 tion is therefore more marked. Now, on turning to 

 the Channel Isles, Jersey and Guernsey, all these four 

 eastern species are stUl found; while the four western 

 species are absent from those Isles, although the Isles are 

 rupestral in character, and occidental in position and 

 climate. The same holds true in continental Normandy, 

 according to Brebisson's Flore de la Normandie. 



It may also be remarked, when the total flora of Britain 

 is under consideration, that several of the exclusively 

 eastern species are simply very local alpines or arctics, 

 found in the East Highland province, but hitherto not 

 detected on the less-examined mountains of the West and 

 North Highlands. In respect of actual longitude, and in 

 general climate, the East Highlands are almost equally 

 western with North Wales and the Lake province ; espe- 

 ciallj'' so if the mountains are under consideration, not the 

 coast-line. It is not a yery scientific mode of expression, 

 to repeat that various very local plants of England or 

 Scotland are accidentally eastern or western, not neces- 

 sarilj'^ so ; and yet it seems allowable to say this, while 

 attention is specially directed to longitude, apart from 

 other conditions of phj^sical geography. 



The truest list of western and eastern species would 

 probably be made out, by selecting them in accordance 

 with any decided predominance on the one side, although 

 not absolutely restricted thereto. Such lists need not 

 include the very local plants, quite absent from one side 

 of the island ; because these would stUl not show any 

 prevalence on the other side. The ' census of species ' 

 affords the data for such lists, that is, so far as differences 

 in the sub-provincial figures may be held evidences of 

 predominance, and the reverse. Space sufficing, the sub- 

 ject of eastern and western species will, be again adverted 



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