SOILS.
The soils over the entire areas of eastern Washington on the arid lands is a volcanic ash mixed with disintegrated basaltic rocks and some humus, varying in depth and in the amount of sand it contains. The low lands are usually more sandy and warmer and earlier in season. The depth of this soil is in some places 80 feet and generally so deep as to insure great permanency to its fertility. It readily absorbs and holds moisture, and is admirably adapted to artificial watering. In some spots there is an injurious surplus of alkali. It is generally covered with sagebrush and has the appearance of sterility, but upon cultivation under irrigation, produces wonderful results in quantity and quality of grains and grasses and fruits and vegetables.