At the State School of Science at Wahpeton, opened in 1903 as a trade school and junior college, two methods of industrial education have been originated, the Babcock plan and the North Dakota plan, both of which have attracted the attention of educators throughout the United States. The former provides for the establishment of three departments within the school--a trade school, a junior college, and a business school, each of which, by a plan of interaction, is made to serve the others. The North Dakota plan, evolved to solve the problem of providing industrial education in an agricultural State, concentrates all trades education in one school, with the exception of night courses offered at other points in the State under the supervision of the school of science. A second junior college was established in 1925 at the school of forestry in Bottineau. North Dakota is now one of the 27 States which have junior colleges. Twenty parochial schools, most of them maintained by the Roman Catholic or the Lutheran Church, offer grade and high school work, and are governed by the State department of public instruction. Under the supervision of the board of administration, the State supports a school for the deaf at Devils Lake, a school for the blind at Bathgate, and an institution for feeble-minded at Grafton. The board also has jurisdiction over the hospital for the insane at Jamestown, the training school for delinquents at Mandan, the penitentiary at Bismarck, and a sanatorium at San Haven. Several semi-public homes and orphanages are operated by churches and other organizations. It is compulsory for all children between the ages of 7 and 15 to attend school, and a student who has not completed the eighth grade must continue in school until he is 17 years of age. Agriculture is a compulsory course in public schools. Free textbooks are provided for rural schools, and uniform texts are prescribed for all public schools. A school census taken in June 1930 showed North Dakota to have a school-age population of 222,798, of whom 169,277 were enrolled in public schools--139,580 in elementary, and 29,697 in high schools. Indian children are given grade and high school education and vocational training in special schools at Fort Totten, Fort Yates, Elbowoods, Belcourt, and Wahpeton. Preservation of tribal arts, including beadwork and pottery, is encouraged.