Besides the cereals, vegetables of nearly all kinds grow to great size on this plateau. Those requiring a more uniformly warm temperature, such as tomatoes, sweet potatoes, beans and peanuts, do best in the region lying south of the Snake River, which is much less elevated than the country north and east. And this is true also of peaches, grapes, and other fruits requiring similar conditions. But as regards most vegetables, especially roots, and also fruits, the plateau generally is very productive. This is almost unaccountable in view of the fact that after the first of June there is little or no rain until late in the fall. Whilst rain seems to be necessary to start the small seeds, large crops of potatoes are sometimes raised without a drop of rain. The moisture must come partly from the soil, which has retained the winter water, and partly from the deposition of moisture by the sea-air which comes through the gap in the Cascade Mountains and penetrates the deep, loose soil. Mr. Paul F. Mohr has measured a parsnip four feet long and eight inches across the top. I saw potatoes in Colfax, thirty of which filled a bushel measure. As before intimated, I doubt whether the plateau can ever become a good grass and hay country. For long forage, besides straw, the people must depend upon the cereals mowed in the green state. [Sidenote: West (not East) Washington is to be the great cattle country.] For this reason the plateau, as will also be the case with the great plains eastward, can never carry the number of cattle that can be grazed in a grass country. A farmer told me it required fifteen acres of bunch grass to support one horse or steer, whilst in a grass country three acres are ample, and on the best sods one acre is sufficient. Still, the bunch grass is, and ought to be, utilized. And the areas of unimproved land are so vast that the herds of cattle, horses and sheep which range upon them altogether constitute a large item of wealth. And on these treeless plains the effort seems to be to train the cattle and horses to live like buffaloes and wild horses in both summer and winter. [Sidenote: Tree-planting.]