AMERICAN INSTITUTE OF an educational institution incorporated in 1925 in the District of Columbia and holding a session for a month each summer. The idea originated in 1923 in the National Co-operative Milk Pro ducers' Federation and readily gained the support of other agri cultural organizations. The purpose of the institute is to collect and disseminate accurate information on the economic, sociological and legal phases of co-operation. So far its attention has been re stricted to agricultural co-operation, but it expects in the future to broaden its field. Representatives of the important agricultural co-operative associations and other farm organizations, and econ omists from universities and research institutions participate in the annual sessions. These are held at various universities. The pro ceedings, published annually under the title American Co-opera tion, constitute a valuable compendium of principles, practices and ideals maintained in the co-operative movement in the United States.