DR. DANIEL K. PEARSONS.
The typical features of the climate of Western Oregon are the rains of Winter and a protracted rainless season in Summer. In other words, there are two distinct seasons in Oregon—wet and dry. Snows in Winter and rains in Summer are exceptional. In Eastern Oregon the climate more nearly approaches conditions in Eastern States. There are not the same extremes, but there are the same features of Winter snow, and, in places, of Summer heat. Southern Oregon is more like Eastern than Western Oregon.
In Eastern Oregon the temperature is lower in Winter and higher in Summer than in Western. The annual rainfall varies from seven to twenty inches.
The Springs in Oregon are delightful; the Summers very pleasant. They are practically rainless, and almost always without great extremes of heat.
Fall rains usually begin in October. It is a noteworthy feature of Oregon Summers, that nights are always cool and refreshing.
The common valley soil of the State is a rich loam, with a subsoil of clay. Along the streams it is alluvial. The "beaverdam lands" of this class are wonderfully fertile. This soil is made through the work of the beavers who dammed up streams and created lakes. When the water was drained away, the detritus covered the ground. The soil of the uplands is less fertile than that of the bottoms and valleys, and is a red, brown and black loam. It produces an excellent quality of natural grass, and under careful cultivation, produces good crops of grain, fruits and vegetables. East of the Cascade Mountains the soil is a dark loam of great depth, composed of alluvial deposits and decomposed lava, overlying a clay subsoil. The constituents of this soil adapt the land peculiarly to the production of wheat.
All the mineral salts which are necessary to the perfect development of this cereal are abundant, reproducing themselves constantly as the gradual processes of decomposition in this soil of volcanic origin proceeds. The clods are easily broken by the plow, and the ground quickly crumbles on exposure to the atmosphere.
In Northwestern Oregon, adjacent to the Columbia River, although the dry season continues for months, this light porous land retains and absorbs enough moisture from the atmosphere, after the particles have been partly disintegrated, to insure perfect development and full harvests.