428 JOURNAI. OF FORESTRY 



sown fail to produce desirable stands when climatic and soil conditions 

 are dissimilar. For many decades American tree seeds have been sown 

 in Europe and seeds from European species have been used in this 

 country. Failures have been far more frequent than successes. 



The species selected by the author for introduction based upon 

 geographical range, silvical characteristics, and meteorological data 

 were as follows : Engelmann spruce, western yellow pine, lodgepole 

 pine. Douglas fir, western red cedar, and black cottonwood. A study 

 of climatological data from the Pacific Coast shows that the climate of 

 British Columbia is more comparable to the climate of Norway than 

 that from any part of the United States and the inference is drawn 

 that Pacific Coast tree seeds for use in Norway should be collected 

 there rather than in the States. 



A comparison of climatological data from British Columbia and Nor- 

 way show striking parallels. Based on differences in precipitation, 

 British Columbia may'be divided into three longitudinal belts, namely, 

 the costal belt, the dry belt, and the interior w^et belt. It is shown that 

 Norway exhibits somewhat similar belts with comparable precipitation 

 and temperatures. The annual precipitation over the costal belt in 

 British Columbia varies from 40 to 120 inches, the greatest precipitation 

 occurring on the western side of Vancouver Island and the outer coast 

 and decreasing eastward toward the axis of the mountains. In Nor- 

 way, the western slope of the mountains extending to the coast has 

 an annual precipitation varying from about 35 to 100 inches. In the 

 dry belt of British Columbia the annual precipitation is less than 20 

 inches. This condition is paralleled in Norway in the eastern part of 

 Jotunheimen and Doore and in the northern part of the eastern valleys. 

 The interior wet belt in British Columbia with an annual precipitation 

 varying from 20 to 60 inches finds its counterpart in the mountains of 

 eastern Norway. 



As temperature differs with altitude and local conditions mean 

 monthly temperatures were compared for selected localities in British 

 Columbia with others in Norway. So also the latest killing frost in 

 spring and the earliest in the autumn were compared so far as data 

 were available. The distribution and silvical characteristics of the 

 species considered for introduction into Norway are discussed in con- 

 nection with climatological data from the two countries. Climatological 

 comparisons were made between Mesnalien and Tonsaasen in Norway 

 and Barkerville and Quesnelle Forks in British Columbia, the latter 



