22. Spencer, Herbert, "The Physiology of Laughter," 1860; in Essays.
23. Fontenelle, B. le B. de, "Entretiens sur la Pluralite des Mondes," 1686.
24. Freud, "Interpretation of Dreams," pp. 237-9.
25. Freud, "Drei Abhandlungen . . . ," trans.: "Three Contributions to the Sexual Theory," Monograph, Journ. Nerv. and Mental Dis. Co., New York, 1909.
26. Jones, Ernest, "Papers on Psycho-Analysis," Chapter XX; W. Wood & Co., 1913.
27. Prince, "The Unconscious;" doctrine of secondary images.
28. Galton, Francis, "Inquiries into Human Faculty," 1883; Macmillan; see essays on association, doctrine of blends.
29. James, William, "Principles . . . ;" The Mental Cue, II, 497, 518; for phrase, "Talks to Teachers," p. ix—118, 1900; Henry Holt & Co., New York.
30. Sherrington, C. S., "Integrative Action of the Nervous System," 1906; Scribners, New York.
31. Bechterew, W. von, "Objective Psychologie oder Psychoreflexologie," 1913; from the Russian, B. G. Teubner, Leipzig and Berlin.