[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 Verhaeltnissen 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 fuer Sozialwissenschaft und Sozialpolitik, 1908 and 1909, vols. 27 and 28.)

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

[21] W.F.  Book:  The Psychology of Skill. (University of Montana, Publications in Psychology, 1910.)

[22] H. Muensterberg:  Beitraege zur experimentellen Psychologie. (Book iv, 1892.)

[23] A.J.  Culler:  Interference and Adaptability. (Archives of Psychology, 1912.)

[24] The experiments are being conducted and will be published by Mr. L.W.  Kline.

[25] Adolf Gerson:  Die physiologischen Grundlagen der Arbeitsteilung.  (Zeitschrift fuer Sozialwissenschaft, 1907.)

[26] Karl Buecher:  Arbeit und Rhythmus. (Fourth Edition, Leipzig, 1909, p. 438.)

[27] Frank G. Gilbreth:  Motion Study. (New York, 1911.)

[28] Taylor:  The Principles of Scientific Management. (New York, 1911, p. 71.)

[29] The experiments are being conducted and will be published by Mr. E.R.  Riesen.

[30] R. Herbertz:  Zur Psychologie des Maschinenschreibens.  (Zeitschrift fuer angewandte Psychologie, 1908, vol. 2, p. 551.)

[31] C.L.  Vaughan:  The Moter Power of Complexity. (Harvard Psychological Studies, vol. 2, 1906, p. 527.)

[32] G.M.  Stratton:  Some Experiments in the Perception of the Movement, Color, and Direction of Lights. (Psychological Review Monographs, vol. 10, 1908.)

[33] The experiments are being conducted and will be published by Miss L.M.  Seeley.

[34] H. Muensterberg:  Beitraege sur experimentellen Psychologie. (Book iv, 1892.)

[35] R.S.  Woodworth:  Accuracy of Voluntary Movement. (Psychological Review Monographs, vol. 8, 1899.)

[36] B.A.  Lenfest:  The Accuracy of Linear Movement. (Harvard Psychological Studies, vol. 2, 1906.)

[37] Ranschburg:  Ueber die Bedeutung der Aehnlichkeit beim Erlernen, Behalten und bei der Reproduktion. (Journal fuer Psychologie und Neurologie, vol. 6.) Ranschburg:  Zeitschrift fuer Psychologie und Physiologie der Sinnesorgane. (Vol. 80, 1902.)

[38] H. Kleinknecht:  The Interference of Optical Stimuli. (Harvard Psychological Studies, vol. 2, 1906.)

[39] The experiments are being conducted and will be published by Miss O.E.  Martin.