[29] Industrial Evolution of the United States, ch. 28.
[30] Evol. of Mod. Cap., 229.
[31] The Effects of Machinery on Wages, 65.
[32] Principles of Economics, I, 315.
[33] Industrial Efficiency, II, 451.
[34] Schloss, Methods of Industrial Remuneration, 305.
[35] Report, VII, 644.
[36] Economics, 377.
[37] Political Economy, 344, 345.
[38] Economics, 133.