This study investigated: (1) the early efforts of agricultural extension to provide educational opportunities for Wyoming settlers at the turn of the century; and (2) the establishment of the Cooperative Extension Service in 1914. The study was primarily an archival and library review of published and unpublished documents, with major emphasis placed on primary sources. The study found that University of Wyoming agricultural officials, prior to 1905, relied primarily on the mail service for the dissemination of knowledge to adults living on farms and ranches. The results of extensive experimentation and research done on experimental farms were provided to rural adults via bulletins, the "Ranchman's Reminder," later called the "Wyoming Farm Bulletin." Agricultural personnel also handled a tremendous amount of correspondence dealing with questions on farming methods and the raising of stock. In 1904 the first short course for ranchers and farmers was offered at the university, and in 1909 demonstration farms were established. Farmers' institutes began in 1905, and in 1909 the first movable schools of agriculture (short courses) were held in Wyoming. An institute train, the Ranchman's Special, was equipped with agricultural exhibits, equipment, machinery, and instructors. It was introduced in 1909, and stopped at 19 places. In 1912 an agreement was signed between the U.S. Department of Agriculture and the University of Wyoming College of Agriculture that provided for cooperative farm management studies, and in 1914 the Smith Lever Act was passed, enabling states to conduct cooperative extension work in agriculture and home economics. Thereafter, organized agricultural extension in Wyoming grew rapidly. (KC)