Postelsia 5 
be brought out through a brief account of posi- 
tion, geological formation, topography, rainfall 
and climate, will add materially towards facili- 
tating the interpretation and explanation of its 
present plant associations and formations. 
Position and extent. Vancouver Island is 
situated between latitudes 48° 15’ and 50° 45’ N. 
o famdizS2307\Ve lt isptlie 
southernmost and the largest of a long chain 
and longitudes 123 
of islands strung out along the west coast of 
North America from Washington to farthest 
Alaska. It is separated from the main land on 
the southwest by the Straits of San Juan de Fuca, 
and on the east and northeast by Johnsons’ 
Straits and the Straits of Georgia. The island 
is in round figures 450 kilometers long by 130 
kilometers wide. The part of Renfrew district 
under consideration lies on the west coast op- 
posite Cape Flattery and comprises the region 
of San Juan Harbor. 
Geological jormation. Geologically this chain 
of islands is a partially submerged extension of 
the; coast tanee or they Pacitie states, Van- 
couver, and this applies in main part for the 
