Section 581, acts May 22, 1928, ch. 678, 1, 45 Stat. 699; Apr. 24, 1950, ch. 97, 17(a), 64 Stat. 87, authorized investigations, experiments, and tests affecting reforestation and forest products through cooperation with State and other agencies. Section 581a, acts May 22, 1928, ch. 678, 2, 45 Stat. 700; June 15, 1936, ch. 553, 49 Stat. 1515, set forth provisions establishing and authorizing appropriations for specific forest experiment stations.