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

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[8] Fechner, G. Th., 'Elem. d. Psychophysik,' Leipzig, 1889; 2. Theil, S. 328.

[9] Hall, G.St., and Donaldson, H.H., 'Motor Sensations on the Skin,' Mind, 1885, X., p. 557.

[10] Op. citat., p. 98.

[11] Auerbach, F., Zeitsch. f. Psych. u. Phys. d. Sinnesorgane, 1874, Bd. VII., S. 152.

[12] Dresslar, F.B., Am. Journ. of Psy., 1894, VI., p. 313.

[13] James, W., 'Principles of Psychology,' New York, 1893, II., p. 250.

[14] James, William, 'Principles of Psychology,' New York, II., p. 250.

[15] Wundt., W., 'Physiolog. Psych.,' 4te Aufl., Leipzig, 1893, Bd. II., S. 144.

[16] v. Helmholtz, H., 'Handbuch d. Physiol. Optik,' 2te Aufl., Hamburg u. Leipzig, 1896, S. 705.

[17] Wundt, W., op. citat., S. 139.