15. Economics of Industry, p. 111.
16. Principles of Economics, pp. 314, 316.
17. Kirkup, Inquiry into Socialism, p. 72.
18. Booth's Labour and Life of the People, vol. i. Part. III. ch. ii. Influx of Population, by H. Llewellyn Smith. A most valuable paper, from which many of the facts here stated have been drawn.
19. The official estimate is not precise, since our statistics of emigration refer only to non-European countries.
20. Labour and Life of the People, vol. i. p. 237.
21. Labour and Life of East London, vol. i. p. 224.
22. Report on the Sweating System, p. 14.
23. Labour and Life of the People, p. 271.
24. Final Report on the Sweating System, § 68.