[123] “Letters on the Æsthetic Education of Mankind,” xxvii.
[124] “Principles of Psychology,” § 533.
[125] “On the Origin of Music,” pp. 231, 232.
[126] “The Play of Animals,” Eng. trans., p. 12.
[127] Op. cit., p. 7.
[128] Op. cit., p. 19.
[129] Op. cit., pp. 75, 76.
[130] “Manual of Psychology,” p. 327.
[131] Op. cit., pref., p. xx.
[132] Op. cit., p. 290.