Snake and on nearly all the important branches of the North Fork, and whose field is 200,000--250,000 acres, almost entirely Federal property, in the W. end of Fremont county between Mud Lake and the lower end of Big Lost river. A further step in irrigation is the utilization of underground waters: in the Big Camas Prairie region, Blaine county, water 10 ft. below the surface is tapped and pumped by electricity generated from the only surface water of the region, Camas Creek. In 1899 the value of the crops and other agricultural products of the irrigated region amounted to more than seven-tenths of the total for the state. In 1907, according to the _Report_ of the state commissioner of immigration, 1,559,915 irrigated acres were under cultivation, and 3,266,386 acres were "covered" by canals 3789 m. long and costing $11,257,023. [Illustration: Map of Idaho and Montana.] Up to 1900 the most prosperous period (absolutely) in the agricultural development of the state was the last decade of the 19th century; the relative increase, however, was greater between 1880 and 1890. The number of farms increased from 1885 in 1880 to 6603 in 1890 and to 17,471 in 1900; the farm acreage from 327,798 in 1880 to 1,302,256 in 1890 and to 3,204,903 acres in 1900; the irrigated area (exclusive of farms on Indian reservations) from 217,005 acres in 1889 to 602,568 acres in 1899; the value of products increased from $1,515,314 in 1879 to $3,848,930 in 1889, and to $18,051,625 in 1899; the value of farm land with improvements (including buildings) from $2,832,890 in 1880 to $17,431,580 in 1890 and $42,318,183 in 1900; the value of implements and machinery from $363,930 in 1880 to $1,172,460 in 1890 and to $3,295,045 in 1900; and that of live-stock from $4,023,800 in 1880 to $7,253,490 in 1890 and to $21,657,974 in 1900. In 1900 the average size of farms was 183.4 acres. Cultivation by owners is the prevailing form of tenure, 91.3% of the farms being so operated in 1900 (2.3% by cash tenants and 6.4% by share tenants). As illustrative of agricultural conditions the contrast of the products of farms operated by Indians, Chinese and whites is of considerable interest, the value of products (not fed to live-stock) per acre of the 563 Indian farms being in 1899 $1.40, that of the 16,876 white farms $4.67, and that of the 23 Chinese farms intensively cultivated and devoted to market vegetables $69.83.