[19] Theorie des Schlafes. Arch. f. d. ges. Physiol. X, 468.
[20] Artificial Anæsthesia and Anæsthetics, pp. 15-17.
[21] Carpenter’s Physiology, 8th ed., p. 852.
[22] Sulla Circolazione del Sangue nel Cervello dell’Uomo. Abstract in Brain, Vol. IV, p. 100.
[23] Transactions of the London Epidemiological Society, Vol. I, p. 116.
[24] De la maladie du sommeil, 1869.
[25] The Medical Record, July 1, 1882, p. 23.
[26] Real. Encyc. der ges. Heilkunde, VIII, 276.
[27] Op. cit. p. 276.
[28] A Summer in Norway, by John Dean Caton, pp. 251 and 311.