[19] Economics, 353.

[20] Political Economy, 381.

[21] Evolution of Modern Capitalism, 297.

[22] Wealth & Progress, 171.

[23] Report Industrial Commission, XIX, 926.

[24] Getting a Living, 475.

[25] Report Industrial Commission, XIX, 746.

[26] Ind. Com., Rep: XIX, 757.

[27] Bull. of U. S. Bur. of Lab., Sept., 1908, p. 418.

[28] Economics, 337.