Harvard Psychological Studies, Volume 1 / Containing Sixteen Experimental Investigations from the Harvard Psychological Laboratory.

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[10] Lipps, Th., Zeitschrift f. Psychologie u. Physiologie der Sinnesorgane, 1890, I., S. 60-74.

[11] Cornelius, C.S., Zeitschrift f. Psychologie u. Physiologie der Sinnesorgane, 1891, II., S. 164-179.

[12] Lamansky, S., Pflüger's Archiv f. d. gesammte Physiologie, 1869, II., S. 418.

[13] Guillery, ibid., 1898, LXXI., S. 607; and 1898, LXXIII., S. 87.

[14] Huey, Edmund B., American Journal of Psychology, 1900, XI., p. 283.

[15] Dodge, Raymond, and Cline, T.S., PSYCHOLOGICAL REVIEW, 1901, VIII., PP. 145-157.

[16] Schwarz, Otto, Zeitschrift J. Psychologie u. Physiologie der Sinnesorgane, 1892, III., S. 398-404.

[17] McDougall, Mind N.S., X., 1901, p. 55, Observation II.

[18] Dodge, PSYCHOLOGICAL REVIEW, 1900, VII., p. 459.

[19] The speed of the pendulum is measured by attaching a tuning-fork of known vibration-rate to the pendulum, and letting it write on smoked paper as the pendulum swings past the 9-cm. opening.