500 X. GENERAL REMARKS. 



of England, in provinces 1 or 2, and in latitude 50 — 51. 

 Tracing northwards, it is seen that some of these plants 

 cease under each successive degree of latitude, and in 

 each successive province from 1 to 18 inclusively. The 

 australs were succeeded in the lists referred to hy the 

 420 ' general species,' enumerated on pages 303 to 305 as 

 occurring continuously in 16 or more provinces. The 

 general species, along with some of the most widely dif- 

 fused of the australs, constitute that numerous group of 

 plants which was designated the British type, because the 

 species are found nearly or quite throughout Britain ; 

 full 300 of them occurring in every province (page 271). 

 Those of the same two divisions which fail to attain the 

 more northern latitudes, or which become decidedly rare 

 in North Scotland, constitute a group designated the 

 English type, mingled with two other tj'pes presently to 

 be mentioned. 



By continuing the glance from page 305 to 312, it may 

 be further seen that a considerable number of the ' boreal 

 and montane species ' are distributed in a very different 

 manner ; only few of them reaching southward to pi*o- 

 Tinces 1 or 2. Far the greater number commence more 

 northward, and extend in the northern direction into pro- 

 vinces 15, 16, 17, or 18, some or all, that is, to the 

 northern coasts of Scotland, or to its lofty hills which are 

 situate between latitudes 56 — 58. If traced southward in 

 a reversed direction from those coasts or mountains, they 

 are fonnd to attain their southern limits in the like 

 gradual succession as the austral species attained their 

 northern limits ; some of them ceasing southwai'd in each 

 successive province from 18 to 1. 



On looking more closely to the numeral figures which 

 represent the provinces in the lists here referred to, it will 

 be further seen that the distribution runs otherwise une- 



