510 X. GENERAL REMARKS. 



small letter *b ' in qualification. The second figure is in 

 excess; in part so doubtless because many widely-diffused 

 species become rare in North Britain ; and while their 

 wide areas are best indicated by the letter 'B,' their 

 northerly attenuation seems to require the qualifying let- 

 ter ' 6 ' added thereto. Both Germanic and Atlantic 

 types are in excess ; the former exceeding a half, and the 

 latter not much below a half, instead of a third. This of 

 course imj)lies that many English plants do slightly pre- 

 vail on one or other side of the island, besides those pri- 

 marily assigned to the eastern and western tj'pes. The 

 numbers of species secondarily assigned to the Highland 

 or Scottish types, especially to the former, are much be- 

 low average ; the montane and boreal plants thus ap- 

 pearing to be more clearly distinguishable from the rest, 

 than the Atlantic and Germanic are from the English. 



On combining the tj'pes into austral, boreal, and gene- 

 ral, we should have the primary numbers brought out 

 thus : — 



English, Gerinaiiic, Atlantic, 606 species. 



Sccitlish, InteniieiHate, Highland, '238 ,, 



British, represeiuiiig the general, 532 „ 

 Local, DdLihtful, 49 „ 



These latter numbers cannot be expected to correspond 

 with those before stated for other groups of species, 

 equally designated 'austral, boreal, and general' on page 

 320 ; the principle on which they are formed being only 

 partially the same, besides the separation of 49 local and 

 doubtful plants. 



It is perhaps of little import to give a tabular summary 

 of the sj)ecies according to their orders. But some bota- 

 nists seek to coimect differences of structure and classifi- 

 cation with difi'erences of age or duration on the earth ; 

 and these again with difi'erences of distribution. An 



