[20] Trans. Med. Soc., London, 1907, vol. xxx, p. 130.
[21] Brit. Med. Journ., 1906, vol. ii, p. 1480.
[22] Bergmann, E. von, Sys. Pract. Surg., vol. ii, p. 245.
[23] Brit. Med. Journ., 1903, vol. ii, p. 1148.
[24] Brit. Med. Journ., 1907, vol. i, p. 7.
[25] Metropolitan Asylums Board’s Ann. Rep., Med. Supplement, 1902–1907.
[26] Cheyne and Burghard, Manual of Surg. Treat., 1901, Pt. v, p. 449.
[27] Tracheotomy in Laryngeal Diphtheria, 2nd ed., p. 42.
[28] Bergmann, E. von, Sys. Pract. Surg., vol. ii, p. 270.
[29] Nose and Throat, 1906, p. 94.