10 Postelsia 
This short survey of these fundamental fac- 
tors and conditions which have to do with plant 
distribution in general, will perhaps suffice to 
give an idea of how they obtain in the region 
under consideration. It is then in line to con= 
sider their bearing upon the floral development 
in this hmited designated area, with reference to 
the organization and division of the plant com- 
munity into its most lkely natural groupings 
and formations, and then further to enter into 
an analysis of the various associations with 
respect to their present imterdependencemama 
floristic composition rather than their historic 
origin and development. 
B, plane Distributton and Adaptation, 
A territorial rather than a biologic basis is 
adopted for primary divisions and upon this 
is built the classification of groupings and _ for- 
mations which is thought best suited for the 
manner of treatment pursued in this work. The 
following synopsis will serve to give an idea of 
the entire scheme. 
