Part 2 — Notes to Chapter XIV.

With regard to the action of poisons in small doses see further Johannsen, Das Aether-Verfahren beim Fruhtreiben, Jena, 1900, and, for Botrytis, see Marshall Ward, "A Lily Disease," Annals of Botany, Vol. II., 1889, p. 388.

The subject of enzymes has been exhaustively treated by Green, The Soluble Ferments and Fermentations, Cambridge, 1899, to which the reader is referred for literature. I have taken the statements regarding Fontaria and Dolium from Kassowitz, Allgemeine Biologie, p. 182. The two most important works on chemotactic phenomena are Pfeffer, "Uber Chemotaktische Bewegungen," etc., Unters. aus dem Bot. Inst. zu Tubingen, B. II., p. 582, and Miyoshi, "Die Durchbohrung von Membranen durch Pilzfaden," Pringsh. Jahrb. f. Wiss. Bot., B. XXVIII., 1895, p. 269, and from these the further literature can be traced. As regards the nature of parasitism see Marshall Ward, "On Some Relations between Host and Parasite," etc., being the Croonian Lecture delivered before the Royal Society, Proc. Roy. Soc., Vol. 47, p. 393. On Symbiosis, see Marshall Ward, "Symbiosis," Annals of Botany, 1899, Vol. XIII., p. 549, where the literature is collected. For a general account of galls the reader may consult Kerner, The Natural History of Plants, Eng. ed., 1895, Vol. II., pp. 527-554, and Adler, Alternating Generations, A Biological Study of Oak Galls, etc., 1894.