For a somewhat fuller discussion of the topic of sensation, see Warren's Human Psychology, 1919, pp. 151-214; and for a much fuller discussion, see Titchener's Textbook of Psychology, 1909, pp. 46-224.{243}

For a really thorough consideration of the facts and theories of color vision, see J. Herbert Parsons, An Introduction to the Study of Colour Vision, 1915.

For a more complete statement of the Ladd-Franklin theory, see the article on "Vision", in Baldwin's Dictionary of Philosophy and Psychology, 1902.

For a recent study that has revolutionized the psychology of the sense of smell, see Der Geruch, by Hans Henning, 1916, or a review of the same by Professor Gamble in the American Journal of Psychology, 1921, Vol. 32, pp. 290-296.

For an extensive discussion of the "Psychology of Sound", sec the book with this title by Henry J. Watt, 1917.

For a full account of taste, see Hollingworth and Poffenberger's Sense of Taste, 1917.

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CHAPTER XI
ATTENTION