[170] Beiträge zur Lehre von den Functionen der Nervencentren des Frosches, p. 41, Berlin, 1869.
[171] Centralb. f. d. med. Wissensch., vol. 7, p. 211, 1869.
[172] Arch. f. Anat., u. Physiol., p. 259, 1869.
[173] Arch. d. Physiol. norm. et pathol., vol. 4, p. 690, 1892.
[174] Arch. f. d. ges. Physiol., vol. 81, p. 222, 1900.
[175] Sanderson: Journal of Physiology, vol. 18, p. 147. Tigerstedt: Archiv f. Physiologie, p. 111, 1895. Boruttau: Archiv f. Physiologie, p. 454, 1892.
[176] ς = thousandths of a second.
[177] Yerkes: Harvard Psychological Studies, vol. I, p. 609, 1903.
[178] The last four classes of Fig. 1 are 100ς classes, 401-500, 501-600, 601-700, 701-800.
[179] Yerkes: Journal of Philosophy, Psychology, and Scientific Method, vol. 2, p. 143.