WILLISTON, Dr. S. W., observation on _Ammophila_, 127 WOOD, Mr. Foster, on hen-swimming, 86 WORCESTER, Dr., on megapode, 87 WUNDT, Prof., on instinct, 65, 99, 106 Y Youth, plasticity of, 168 Yucca moth, instincts of, 82 THE END PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, LONDON AND BECCLES FOOTNOTES [1] See “The Psychology of a Protozoon,” in the _Amer. Jour. of Psychology_, vol. X., No. 4, July, 1899, and the fuller papers there quoted. [2] “The Psychic Life of Micro-Organisms,” 1889, p. 61. [3] This paragraph is taken from “Animal Life and Intelligence,” p. 28. [4] The following paragraphs are taken with some slight changes from “Animal Life and Intelligence,” pp. 30-35. [5] D. H. Scott, “An Introduction to Structural Botany,” part ii., “Flowerless Plants,” pp. 70, 71. [6] _Ibid._, p. 71. [7] Kerner, “Natural History of Plants,” translated by F. W. Oliver, vol. i., p. 145. [8] Kerner, “Natural History of Plants,” vol. i., p. 536. [9] Kerner, “Natural History of Plants,” vol. ii., p. 132. [10] Darwin, “Fertilization of Orchids,” 2nd edit., pp. 191, 192. [11] “Mental Evolution in Animals,” p. 50. [12] _Ibid._, p. 51. [13] “A Text-book of Physiology,” 5th edit., part iii., p. 909. [14] “A Text-book of Physiology,” 5th edit., part iii., pp. 911, 912. [15] Professor Mark Baldwin has applied the term “organic selection” to the result of this interaction (_American Naturalist_ for June and July, 1896). Cf. also H. F. Osborn (_Science_, Nov. 27, 1896); August Weismann (Romanes Lecture on “The Effects of External Influences on Development,” 1894), and “Germinal Selection,” _Monist_, Jan., 1896; and the author’s “Habit and Instinct,” ch. xiv., 1896. [16] “Habit and Instinct,” p. 26. [17] _American Journal of Psychology_, vol. ix., No. 1. [18] _Psychological Review_, vol. vi., No. 3. [19] “Naturalist in La Plata,” p. 88. [20] _Journal Asiatic Society of Bengal_, lxvii., part ii., 1897, p. 614. [21] _Spectator_, No. 120. [22] Kirby and Spence, “Introduction to Entomology,” Letter xxvii. p. 537 (7th Edit., 1858). [23] Cf. supra, p. 18. [24] “The Play of Animals,” translated by Elizabeth L. Baldwin, p. 62. [25] George W. and Elizabeth G. Peckham, “On the Instincts and Habits of the Solitary Wasps,” p. 231. [26] “Lectures on Human and Animal Psychology,” pp. 388, 397, 399. [27] “Instinct and Reason,” pp. 90, 92. [28] “Instinct and Reason,” p. 91. [29] Chapter I., Section V. [30] “On the Habits and Instincts of the Solitary Wasps,” by George W. and Elizabeth G. Peckham (1898). [31] “Mental Evolution in Animals,” p. 299. [32] “Organic Evolution,” translated by J. T. Cunningham, p. 280. [33] See A. G. Mayer “On the Mating Instinct of Moths.” _Ann. and Mag. of Nat. Hist._, ser. 7, vol. v., Feb., 1900, p. 183. [34] Some of the observations on which the summary of results given in this section are founded are presented in some detail in “Habit and Instinct,” pp. 29-100.