Thorndike's Animal Intelligence, Experimental Studies, 1911, reports his own pioneer work in this field. See also Chapter X in the same author's Educational Psychology, Briefer Course, 1914.

For other reviews of the work on animal learning, see Watson's Behavior, 1914, pp. 184-250; also Washburn's Animal Mind, 2nd edition, 1917, pp. 257-312.

For human learning and practice, see Thorndike's Educational Psychology, Briefer Course, 1914, Chapters XIV and XV; also Starch's Educational Psychology, 1919, Chapter XI.

For an experiment showing the acquisition of fears by a child, see Watson and Raynor, "Conditioned Emotional Reactions", in the Journal of Experimental Psychology, 1920, Vol. 3, pp. 1-14.

James's chapter on "Habit", in his Principles of Psychology, 1890, Vol. I, is a classic which every one should read.

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CHAPTER XIV
MEMORY