[15] J. Sadger, Aus dem Liebeslebens Nicolaus Lenaus, Leipzig, 1909, 96 p. See also his biography by B. E. Castle.
[16] J. Sadger in Grenzfragen des Nerven und Seelenlebens, 1910, pp. 5–63.
[17] G. Vorberg, Guy de Maupassant’s Krankheit, 1908, 27 p.
[18] Otto Kaus, Schriften des Vereins freie psychoanalytische Forschung, No. 2, 1912, 81 p.
[19] P. J. Moebius, Ueber Scheffel’s Krankheit, 1907, p. 40.
[20] E. T. Cook, Life of John Ruskin, London, 1911, vol. ii, p. 19.
[21] Frau Foerster-Nietzsche, The Life of Nietzsche.
[22] “On Growing Old,” Atlan., 1915, p. 803.
[23] “Concerning Age,” Sci. Amer. Sup., Nov. 15, 1919.
[24] “The Moral and Religious Psychology of Late Senescence,” Biblical World, 1918, p. 75.