For the James-Lange theory, see the chapter on the emotions by William James, in his Principles of Psychology, 1890, Vol. II, pp. 442-485.

For Darwin's views on expressive movements, see his Expression of the Emotions in Man and Animals, first published in 1872.

For pictures of facial expression in various emotions, see Antoinette Feleky, in the Psychological Review for 1914, Vol. 21, pp. 33-41.

For the internal physiological changes, see Walter B. Cannon's Bodily Changes in Pain, Hunger, Fear and Rage, 1915.

For an interesting and important view of the close connection between emotion and instinct, see William McDougall's Introduction to Social Psychology, Chapter II.

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CHAPTER VIII
INVENTORY OF HUMAN INSTINCTS AND PRIMARY EMOTIONS