248 THE DISPERSION OF BRITISH PLANTS. 
Extracts and Whstracts. 
THE DISPERSION OF BRITISH PLANTS, 
-By T. Comnrnr. : i 
[Extracts from a paper read before the Historic Society of Lancashire 
-. - ‘and Cheshire, January 22nd, 1874, | i 
Lasr Session I had the honour of reading before your Society 2 
paper on “ The World-Distribution of British Plants.”* An attempt 
was therein made to arrange the members of our flora into certain 
many of which have already been treated of by different ot : 
and ‘especially by Professor Alph. De Candolle in his ‘ @éograpm? 
Botanique.”’ 
Dispersion with Regard to Latitude. 
Wine Rancx or Norraean Prants,—On considering the pred 
rative area of plants, one of the first facts, which cannot fail to ng 
attention, is that Northern plants range more widely East and 
han those of more Southern latitudes. ee 
Two of the causes which have been assigned for this 5 
evident, viz.: lst—That the actual extent of ground a plant has 
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climate, and with a sufficient length of time, the spre 
over land is easy ; the chance of seeds being carried acros 
* See pp. 84—88 for an abstract of this paper. 
