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The machines and engines by which these powers have been adapted to man's uses come naturally first under consideration. The range of industrial operations, or TnechanicaZ pro-cesses to which powers are applied, may fee embraced in two
Theory of Culture Change. The Methodology of Multilinear Evolution. Julian H. Steward. University of Illinois Press, Urbana, 1955. 244 pp., 5 tables. $4.00.