d 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.

[40] Henry P. Kendall: Unsystematized, Systematized, and Scientific
Management. (In Addresses