Section 581b, act May 22, 1928, ch. 678, 3, 45 Stat. 701, authorized appropriations for investigations of diseases of forest trees and products. Section 581c, act May 22, 1928, ch. 678, 4, 45 Stat. 701, authorized appropriations for investigations of forest insects. Section 581d, act May 22, 1928, ch. 678, 5, 45 Stat. 701, authorized appropriations for experiments and investigations of life histories and habits of forest animals, birds, and wildlife. Section 581e, act May 22, 1928, ch. 678, 6, 45 Stat. 701, authorized appropriations for investigations of the relationship of weather conditions to forest fires. Section 581f, act May 22, 1928, ch. 678, 7, 45 Stat. 701, authorized appropriations for experiments and investigations for development of improved methods of management of forest ranges. Section 581g, act May 22, 1928, ch. 678, 8, 45 Stat. 701, authorized appropriations for experiments, investigations, and tests of the physical and chemical properties of forest products. Section 581h, acts May 22, 1928, ch. 678, 9, 45 Stat. 702; May 31, 1944, ch. 217, 58 Stat. 265; June 25, 1949, ch. 245, 63 Stat. 271; Aug. 8, 1953, ch. 378, 67 Stat. 489; Sept. 25, 1962, Pub. L. 87–685, 76 Stat. 579; Dec. 14, 1967, Pub. L. 90–193, 81 Stat. 579; Aug. 17, 1974, Pub. L. 93–378, § 3(b), formerly 2(b), 88 Stat. 476, renumbered Oct. 22, 1976, Pub. L. 94–588, § 2, 90 Stat. 2949, set forth provisions relating to comprehensive survey and analysis of the present and prospective conditions of and requirements for renewable resources. Section 581i, act May 22, 1928, ch. 678, 10, 45 Stat. 702, authorized appropriations for economic investigations of forest lands and forest products.