[35] _Psychological Review_, May, 1899, p. 286. [36] “Birds from Moidart and Elsewhere,” p. 107. Edinburgh: Douglas. [37] _Transactions of Northumberland and Durham Natural History Society_, vol. viii., p. 213. [38] “Mental Evolution in Animals,” p. 159. [39] “Lectures on Human and Animal Psychology,” p. 401. [40] “Instinct and Acquisition,” _Nature_, vol. xii., p. 507. [41] On the nature of impulse, see _infra_, p. 235. [42] “Lectures on Human and Animal Psychology,” p. 405. [43] “Organic Evolution,” pp. 223, 263, 258, 279, 276, 298. [44] “Essays on Heredity” (1889), p. 91. [45] _Op. cit._, pp. 196-198. [46] Professor Henry Osborn has also indicated the relationship referred to. [47] “The Play of Animals,” p. 64. [48] “Solitary Wasps,” p. 236. [49] See D. Sharp, “Cambridge Natural History,” “Insects,” part ii., p. 293, and the original authorities cited on p. 294. [50] This and the three succeeding paragraphs are taken from “Animal Life and Intelligence,” p. 425. [51] “Animal Intelligence,” p. 59. [52] “Instincts and Habits of the Solitary Wasps,” p. 55. [53] _Op. cit._, p. 22. [54] _Op. cit._, p. 215. [55] “Dürfen wir den Ameisen und Bienen psychische Qualitäten Zuschreiben.” _Pflüger’s Archiv._, lxx., 1898. [56] “Solitary Wasps,” p. 219. [57] _Op. cit._, pp. 131, 132. [58] In a letter to Darwin, quoted by Romanes, “Mental Evolution in Animals,” p. 226. [59] “The Structure and Life of Birds,” p. 335. [60] Preface to “Harmonia Ruralis,” quoted by Yarrell, “British Birds,” vol. i., p. 541. [61] _American Journal of Psychology_, vol. viii., no. 4, pp. 431-493. [62] “Introduction to Comparative Psychology,” p. 255. [63] “Introduction to Comparative Psychology,” p. 290. [64] _The Portfolio_ (1873), p. 27, “Canine Guests.” [65] “Animal Intelligence,” pp. 28, 29. [66] _Nature_, vol. xxxi., p. 200. [67] _Ibid._, vol. li., p. 127. [68] “Manual of Psychology,” p. 257. [69] “Vegetable Mould and Earthworms,” p. 95. [70] _Wood’s Holl Biological Lectures_ (1898), p. 287. [71] _Supra_, p. 44. [72] “Mental Evolution in Man,” p. 27. [73] “Intelligence of Animals,” p. 121. [74] “Mental Development in the Child and the Race--Methods and Processes,” p. 278. [75] “Animal Intelligence:” monograph supplement to _Psychological Review_, 1898, p. 61. [76] _Op. cit._, pp. 263, 172, 201, 132, and 248 (note). [77] “Animal Intelligence,” pp. 47-64. [78] _Op. cit._, pp. 66, 14, 15. [79] Cf. _infra_, p. 235. [80] “The Play of Animals,” Eng. trans., p. 79. [81] “Habit and Instinct,” pp. 174-180. [82] “The Evolution of Mind in Man,” footnote, pp. 25, 26. Quoted in “Introduction to Comparative Psychology,” from which the comments on it are extracted. [83] “The Speech of Monkeys.” [84] “Scientific Lectures,” pp. 112, 118. [85] _Nature_, vol. vii., p. 443. [86] “The Senses of Animals,” p. 277. [87] “Mental Evolution in Man,” p. 100. [88] _Op. cit._, p. 175.