igS TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



to the habits of the associated species. As commercial timber it 

 is found from sea-level up to 1200 feet; above this elevation it is 

 more or less of small scrubby growth, and at 2400 or 3000 feet 

 it is a low sprawling shrub. 



It occurs, rather scattered, and in sheltered places from 

 Kukak Bay at the bottom of the Alaskan Peninsula, on the 

 east to west sides of Cook Inlet, and the northern part of 

 Kodiak Island, extending around Kinai Peninsula on the shores 

 of Cook Inlet to Prince William Sound. It continues eastward, 

 crossing the extreme north end of Lynn Canal at Skagway, 

 extending southwards in a narrow strip on the mainland, and 

 ranging throughout the Alexander Archipelago. 



British Columbia. — From Observatory Inlet, which runs 

 almost parallel to the Portland Canal (the International 

 Boundary Line), Sitka spruce extends farther inland. How- 

 ever, the valuable commercial timber forests of this species 

 rarely extend farther south than Rivers Inlet, lat. 51° 30'. 



Regionally the best development is reached in the Queen 

 Charlotte Islands. Numerically the spruce will generally not 

 form more than 15-20 % of the stand, but from the standpoint 

 of volume it will be in the neighbourhood of 50-80 % in its 

 optimum range. 



On the west side of Vancouver Island fairly good stands 

 occur in the Alberni district, up to 900 feet. But on the main- 

 land and in Vancouver Island, generally, Sitka spruce is a 

 smaller tree and not so numerous. 



Running in a south-east direction it crosses the Fraser River 

 and C.P.R. at Kanaka, a little south of the confluence of the 

 Thompson and Fraser Rivers. It then turns almost directly 

 south and passes into Washington down long. 121°. Its south- 

 east limit of range is never far from the Fraser River. 



Washington. — It is found chiefly on bottom-lands and mouths 

 of rivers along the Pacific Coast and Puget Sound. It is 

 sparsely scattered and extends up valleys and on benches to the 

 foothills of the Cascades, chiefly below 2000 feet. 



In northern Oregon the distribution is similar to the fore- 

 going, but south of the Columbia River it is confined to the 

 coast. 



In California, Sitka spruce is found only at the mouths of 

 rivers and in low valleys facing the sea, as far south as 

 Mendocino County, about lat. 40°. 



