LITERATURE CITED 
ADERHOLD, R. 
(1) 1900. Die Fusicladien unserer Obstbaume. Landw. Jahrb. 29: 541-587. 
ARCICHOVSK]J, V. 
(2) 1908. Zur Frage iiber den Einfluss von ZnSO, auf eine Reihe von Generationen 
von Aspergillus niger. Centr. f. Bakt. II, 21: 430. 
ARTHUR, J. C. 
(3) 1917. Cultures of Uredineae in 1916 and 1917. Mycol. 9: 295-312. 
(4) 1920. North American Flora. 7 (pt. 4): 296. 
BAERTHLEIN, K. 
(5) 1918. Ueber bakterielle Variabilitat, insbesondere sogenannten Bakterienmu- 
tationen. Centr. Bakt. I. Abt. Orig. Bd. 81: 369-475. 
BAKKE, A. L. 
(6) 1912. The late blight of barley (Helminthosporium teres Sacc.). Proc. la. 
Acad. Sci. 19: 93-102. 
BaRBER, M. A. 
(7) 1907. On heredity in certain micro-organisms. Kan. Univ. Sci. Bul. 4: 1. 
Bary, A. DE 
(8) 1886. Ueber einige Sclerotien und Sclerotienkrankheiten. Bot. Zeit. 44: 
378-387, 410-426. 
(9) 1887. Comparative morphology and biology of the fungi Mycetozoa and 
Bacteria. Translation by H. E. Garnsey. 
BATESON, W. 
(10) 1902. Mendel’s principles of heredity. Cambridge. 
Baur, E. 
(11) 1914. Einfiihrung in die experimentelle Vererbungslehre. Berlin. 
Beacu, W. S. 
(12) 1919. Biologic specialization in the genus Septoria. Am. Jour. Bot. 6: 1-33. 
BEAUVERIE, J., and GUILLIERMOND, A. 
(13) 1903. Etude sur la structure du Botrytis cinerea. Centr. f. Bakt. II. 10: 
275-311. 
BeckwitH, T. D. 
(14) 1911. Root and culm infections of wheat by soil fungi in North Dakota. 
Phytopathology, 1: 169-176. 
BEHRENS, J. 
(15) 1895. Phytopathologische Notizen I. Zeit. f. Pflanzenkrank. 5: 136-141. 
BENeEDIcT, R. C. 
(16) 1916. The origin of new varieties of Nephrolepis by orthogenetic saltation. 
Bul. Torr. Bot. Club, 43: 207-234. 
Bissy, G. K, 
(17) 1916. The Uredinales found upon the Onagraceae. Am. Jour. Bot. 3: 527-561. 
BLACKMAN, V. H., and WELSFoRD, E J. 
(18) 1916. Studies in the physiology of parasitism. II. Infection by Botrytis 
cinerea. Ann. Bot. 30: 389-397. 
