[11] F.W. Taylor: The Principles of Scientific Management, pp. 86-97.

[12] The experiments are being conducted and will be published by Mr. J.W. Bridges.

[13] Investigation of Telephone Companies: Bureau of Labor. (Washington, Government Printing Office, 1910.)

[14] Ries: Beiträge zur Methodik der Intelligenzprüfung. (Zeitschrift für Psychologie, 1910, vol. 56.)

[15] For a survey of a large number of such tests and bibliography, compare: G.M. Whipple: Manual of Mental and Physical Tests. (Baltimore, 1911.)

[16] F.L. Wells: The Relation of Practice to Individual Differences. (American Journal of Psychology, 1912, vol. 23, pp. 75-88.)

[17] M. Bernays: Auslese und Anpassung der Arbeiterschaft der geschlossenen Grossindustrie, dargestellt an den Verhältnissen der Gladbacher Spinnerei und Weberei. (Leipzig, 1910, p. 337.)

[18] H.C. McComas: Some Types of Attention. (Psychological Review Monographs, vol. 13, 3, 1911.)

[19] Max Weber: Zur Psychophysik der industriellen Arbeit. (Archiv für Sozialwissenschaft und Sozialpolitik, 1908 and 1909, vols. 27 and 28.)

[20] Bryan and Harter: Studies in the Telegraphic Language. (Psychological Review, vol. 4.)