[50] Ch. Salmonsen et Th. Madsen: Réproduction de la substance antitoxique. Ann. Inst. Pasteur, XII, p. 762. Roux et Vaillard: Ibid., 1893, p. 83.
[51] It is understood that the active principles of mushrooms are not comprised under this definition, but they will be studied under the next heading.
[52] Warden and Waddell: Non-bacillar Nature of Abrus Poison. Calcutta, 1884.
[53] Kobert: Arbeit. aus dem Pharmak. Institut. Dorpat, 1893.
[54] Hellin: Inaug. Dissert. Dorpat, 1891.
[55] Ehrlich: Experiment. Untersuchungen über Immunität. Deutsch. Med. Woch., 1891.
[56] Stillmark: Arbeit. aus dem pharmacol. Inst. Dorpat, 1889.
[57] Dixon: Austr. Med. Gazette, 1887.
[58] Thuson: Journ. f. prakt. Chem., XCIV, p. 444.
[59] Power and Cambier: Pharm. Journ. and Transact., 1890.