Part 2 — Notes to Chapter XVII.

The principal literature, now very voluminous, on this subject is contained in the publications of the U.S. Department of Agriculture from 1890 onwards. See especially Bulletins, Nos. 3, 6, and 9; Farmers' Bulletin, No. 91, 1899; and The Journal of Mycology during the same period. See also Lodeman, The Spraying of Plants, London, 1896. A summary of the principal processes will be found in Massee, Text-Book of Plant Diseases, pp. 31-47.

With regard to the history of the subject, which still needs writing, the reader should not overlook Roberts, "On the Therapeutical Action of Sulphur," St. George's Hospital Reports, date unknown, but subsequent to the following: Berkeley, Introduction to Cryptogamic Botany, 1857, p. 277, with references. These are, I believe, with the references to steeping of wheat in De Bary, Unters. über d. Brandpilze, Berlin, 1853, among the first attempts to utilise such remedies.

Further facts will be found in the pages of the Gardeners' Chronicle, especially since 1890, and in Zeitsch. f. Pflanzen-krankheiten since 1891.