It is enough, perhaps, to reveal these two sources as probable factors in the development of Dewey's psychological method. No speculation upon them is necessary. At most, they were merely contributory to Dewey's thought, and by fitting in with his previous ideas enabled him to give a more concrete presentation of his psychological theory than would otherwise have been possible. FOOTNOTES: [116] Vol. III, pp. 357-370. [117] _Ibid._, p. 357. [118] _Op. cit._, p. 365. [119] _Ibid._ [120] _Ibid._, p. 366, note. [121] _Op. cit._, p. 370. [122] _Ibid._, p. 368. [123] Vol. VI, pp. 43-56. [124] _Op. cit._, p. 46. [125] _Ibid._, p. 48. [126] _Op. cit._, p. 50. [127] _Ibid._, p. 52. [128] _Ibid._, p. 51. [129] _Op. cit._, p. viii. [130] _Ethical Studies_, p. 160 f. [131] _Outlines of Ethics_, p. 97. [132] _Ibid._, p. 99. [133] Vol. I, pp. 553-569; Vol. II, pp. 13-32. [134] _Principles of Psychology_, Vol. II, p. 449. [135] _Psy. Rev._, Vol. II, p. 15 f. [136] _Ibid._, p. 24 f. [137] _Ibid._, p. 24. CHAPTER V THE EVOLUTIONARY STANDPOINT Dewey's psychology is linked up with his logical theory, as has already been suggested, through the interpretation of the thought-process as a mode of adjustment involving inference. This conception of thought implies, of course, that thought is an instrument of adaptation, and this in turn suggests that the organ of reflection is a product of evolutionary forces operating on the individual and on the race. In the period now to be reviewed Dewey, for the first time in his career, displays an active and intense interest in evolutionary theory, especially as applied in the fields of ethics and psychology.