By the help of these ditches the people of Yakima Valley are producing corn, which under the hot sun of the locality perfects its product. Tobacco has been tried also with fair results. And the Moxee County will try the dairy business. There is a disposition also to try improved breeds of cattle. The spirit of enterprise has resulted largely from the passage of the Northern Pacific Railroad along the Yakima Valley; but at the same time the greatest obstacle in the way of irrigation lies in the ownership of alternate sections by this railroad. The Yakima Indians have good lands, and Klickatat County is well spoken of. Sweet potatoes, tomatoes, peaches, grapes, and other things requiring much heat, are said to thrive in the lower parts of the Yakima Valley. [Sidenote: The Great Plain.] [Sidenote: Boundaries.] We enter now the last grand division of the country, the Great Plain, or, more strictly, plateau of the Columbia River. In spite of its unpromising aspect, this is the chief agricultural region of the Pacific States. To get the exact boundary, find the point (a little below Wallula Junction) where Washington and Oregon both corner on the Columbia River. From this point, follow the Columbia up to the mouth of Spokane River; follow Spokane River up to the Idaho line; follow the Idaho line south to the Oregon line; follow the Oregon line due-west to the beginning, and within these lines lies the region which is destined to be the granary of the Pacific States. [Sidenote: Early history.] The settlement of this plain began near Walla Walla, where a Christian mission was established by Whitman, the hero and martyr, who saved this country to the United States. Hence the most thickly populated part of the plain is between the Oregon line and Snake River. This region was supplied with transportation by the Oregon Railway and Navigation Company. The largest agricultural production is here. [Sidenote: Area and population.] Immigration next moved north of Snake River into the valley of the Palouse River, and here we have the next largest area of production. When the Northern Pacific Railroad came in from the east, the new-comers entered the Great Bend country, which is the northern half of the plain. The chief settlement here is in Spokane and Lincoln counties, which cover nearly half of the Great Bend. Douglas County covers the remainder, and is beginning to be settled. There are ten counties on the plateau, with an aggregate area of 20,000 square miles and a population of 52,000. Of this population, 20,000 is south of the Snake River, 14,000 north of Snake River, and 18,000 in the Great Bend, including Spokane Falls. [Sidenote: Amazing wheat crops: surpassing all other States.]