[47]. Pp. 170 et seq.
[48]. For some facts, which may or may not be well authenticated, see Féré, op. cit., p. 234.
[49]. Féré, Pathologie des Emotions, pp. 293, 294.
[50]. Schüle, Traité clinique des maladies mentales, Art. “Mélancolie” (French edition), pp. 21, 28.
[51]. G. Dumas, Les états intellectuels dans la mélancolie, where may be found several detailed observations.
[52]. Krafft-Ebing, op. cit., vol. ii., sec. 1, chap. i.
[53]. For a short historical summary of the question up to the middle of the nineteenth century, see Bouillier, Du plaisir et de la douleur, chap. xi.
[54]. See Mind, Oct. 1887, Jan. and April 1888, Jan. 1889; and J. Sully, The Human Mind, vol. ii. pp. 4, 5.
[55]. Psychologie physiologique, iv., ch. i., pp. 309 et seq. (French edition.)
[56]. Wundt, Grundzüge der physiol. Psychologie (4th German ed.), vol. i. pp. 557 et seq.; Lehmann, Hauptgesetze, etc., §§ 236-241. One of Wundt’s most distinguished pupils, Külpe, in his Umriss der Psychologie (1895), considers the existence of a state of indifference “can hardly be doubted in the face of a long series of observations which support it.” (English edition, p. 242.)