Page:The Columbia River - Its History, Its Myths, Its Scenery Its Commerce.djvu/43

Rh the sunlight is stopped or filters through only in pale and watery rays. Hence all manner of vines and shrubs grow with almost tropic profusion, though with weak and straggling stems.

Throughout the entire Pacific North-west the soil is of extraordinary fertility. It is largely of volcanic dust as fine as flour and seems to contain the constituents of plant life in inexhaustible abundance. Even in the arid belts of Eastern Oregon, where to the eye of the stranger the appearance is of a hopeless waste, those same elements of plant food exist, and with water every manner of tree or vine or flower bursts quickly into perfect life.

The climate of the Columbia Basin is a puzzle to the stranger, but in most of its aspects it quickly becomes an equal delight. As is well known, the Japan ocean current exercises upon the Pacific Coast an effect similar to that of the Gulf Stream on Ireland and England. Hence the states of the Columbia Valley are much warmer in winter than regions of the same latitude on the Atlantic Coast or in the Mississippi Valley. Though the average temperature is higher, yet it is cooler in summer on the Pacific Coast than on the Atlantic. The Pacific climate has much less of extremes. The State of Washington has about the same isothermal line as North Carolina. There is, however, another feature of the Columbia climate not so well known to non-residents, which is worthy of a passing paragraph. This is the division of the country by the Cascade Mountains into a humid western section and a dry eastern one. The mountain wall intercepts the larger part of the vapour rising from the Pacific and flying eastward, and these warm masses