[3] Hermann’s _Handbuch der Physiologie_, Vol. IV, Part II, p. 98. [4] _Handbuch der Kinderkrankheiten_, Vol. I, p. 346. [5] _Handbuch der Physiologie_, Vol. IV, Pt. II, p. 217. [6] _Op. cit._, pp. 142 and 456. [7] _Dic. Encyc. des Sci. Méd._, Art. SOMMEIL, pp. 277. [8] Quoted by Vierordt, _Handbuch der Kinderkrankheiten_, Vol. I, p. 307. [9] _Dic. Encyc. des. Méd._, Ie série, t. XV, p. 75. [10] _Handbuch der Kinderkrankheiten_, Vol. I, p. 383. [11] _Carpenter’s Physiology_, 8th edition, p. 560. [12] _Handbuch der Physiologie_, Vol. II, Pt. II, p. 297. [13] Quincke, _Archiv. f. Experim. Pathol._, Vol. VII, p. 115. [14] _Carpenter’s Physiology_, 8th edition, p. 526, _Handbuch der Kinderkrankheiten_, 2d edition, Vol. I, p. 373. [15] _Dic. Encyc. des Sci. Méd._, IIIe Série, Vol. X, p. 268. [16] _Handbuch der Physiologie_, Vol. V, p. 142-156. [17] Kohlschütter, _Messungen der Festigkeit des Schlafes. Dissert._ Leipzig, 1862, _und Zeitschrift f. rat. Med._, 1863. Quoted, Hermann’s _Handbuch der Physiologie_, Vol. II, Pt. II, p. 295. [18] _Obersteiner, Zur Theorie des Schlafes, Zeitschr. f. Psych._ XXIX. _Preyer, Ueber die Ursachen des Schlafes._ Vortrag. Stuttgart bei Enke. 1877, und centralbl. f. d. Med. Wiss. 1875. S. 577. [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. [29] A. Maury, op. cit., p. 156. [30] _Among the Indians of Guiana._ By Everard F. Im Thurn. [31] _Le Sommeil et les Rêves_, p. 154. [32] _Nature_, Vol. XXIX, pp. 438-462. [33] _Ganot’s Physics._ [34] _Dic. Encyc. des Sci. Méd._, Art. CLIMAT. [35] _Comptes-rendus Acad. des Sci._, 1840, t. XI, p. 823. [36] _Am. Journ. Med. Sci._, April, 1877, p. 305. [37] A remarkable illustration of this will be found related in _The Lancet_, July 26, 1884, p. 112. [38] _Dic. Encyc. des Sci. Méd._, Art. FROID, p. 139. [39] _Medical and Surgical Electricity_, 4th ed., p. 413. [40] _Nature_, March, 1883. [41] _Lo Sperimentale_, April, 1884. [42] _Artificial Anæsthesia and Anæsthetics_, pp. 20-28. William Wood & Co., New York, 1881. [43] _Bull. gén. de Thérap._, 1884, 2º Livr. [44] _Centralblatt für klin. med._, 1884. Nr. 12. [45] _The National Dispensatory_, 1884, p. 433. [46] _Deutsche Med. wochenschr._, 1883, Nr. 49. [47] _Lo Sperimentale_, April, 1884. [48] _The National Dispensatory_, 1884, p. 993. [49] Kiernan, _Journ. Nerv. and Mental Diseases_, Vol. X, p. 234. [50] _Psychological Medicine_, Bucknill and Tuke, 4th ed., p. 731.