[1] Förstudier till en konstfilosofi, Helsingfors, 1896. A summary in German of this book can be read in Zeitschrift für Psychologie und Physiologie der Sinnesorgane, Bd. xvi. pp. 233-235.
[2] Baumgarten, Aesthetica, pp. 1, 3, 6 sq.
[3] Bosanquet, History of Æsthetic, pp. 173, 187.
[4] Cf. e.g. Hanslick, Vom musikalisch Schönen, p. 3.
[5] Kant, Kritik der Urtheilskraft, p. 147, to be compared with Kant’s chapters on beauty.
[6] Schiller, Über die ästhetische Erziehung des Menschen, passim.
[7] Spencer, Principles of Psychology, ii. pp. 628, 632. Cf. also the extracts from a letter written by Mr. Spencer to M. Guyau, quoted in Les problèmes de l’esthétique contemporaine, p. 18.
[8] Hennequin, La critique scientifique, pp. 26-28.
[9] Grosse, Die Anfänge der Kunst, pp. 46, 47.
[10] Grant Allen, Physiological Æsthetics, pp. 32, 33.