INDEX TO AMERICAN BOTANICAL LITERATURE 427 
Cook, M. T. Common diseases of garden vegetables and truck crops. 
New Jersey Agr. Exp. Sta. Circ. 89: 1-22. f. 1-12. 1-D 1917. 
Coons, G.H. Michigan potato diseases. Michigan Agr. Exp. Sta. 
Spec. Bull. 85: 1-49. f. r-41. Mr 1918. 
Davis, J. J. Tilletia on wheat in North Dakota. Phytopathology 8: 
247. 11 My 1918. 
Dearing, C. The production of self-sterile muscadine grapes. Proc, 
Am. Soc. Hort. Sci. 1917: 30-34. Mr 1918. 
Dickson, J.G. The value of certain nutritive elements in the develop- 
ment of the oat plant. Am. Jour. Bot. 5: 301-324. f. 1-5. 6 Jl 1918. 
Dodge, B.O. Studies in the genus Gymnosporangium—I. Notes on 
the distribution of the mycelium, buffer cells, and the germination of 
the aecidiospore. Brooklyn Bot. Gard. Mem. 1: 128-140. pl. 1 
+ f.1-5. 6 Jl 1918. 
Dorsey, M. J. The inheritance of some biological facts on bud varia- 
tion. Proc. Am. Soc. Hort. Sci. 1916: 41-71. Mr 1917. 
Duff, G. H. Some factors affecting viability of the urediniospores of 
Cronartium ribicola. Phytopathology 8: 289-292. f.z. 15 Jl 1918. 
Durst, C. E. Studies in lettuce breeding. Proc. Soc. Hort. Sci. 1915: 
96-98. F 1916. : 
East, E. M. The rdle of reproduction in evolution. Am. Nat. 52: 
273-289. Jl 1918. 
Evans, A.W. The American species of Marchantia. Trans. Connecti- 
cut Acad. Arts & Sci. 21: 201-313. f. 1-20. Mr. 1917 ° 
Includes Marchantia breviloba sp. nov. 
Fernald, M. L. The diagnostic character of Vallisneria americana. 
Rhodora 20: 108-110. 11 Je 1918. 
Fernald, M. L. The geographic affinities of the vascular floras of New 
England, the maritime provinces and Newfoundland. Am. Jour. 
Bot. §: 219-236. pl. 12-14. 21 Je 1918. 
Fernald, M.L. The contrast in the floras of eastern and western New- 
foundland. Am. Jour. Bot. 5: 237-247. pl. 15-17-21 Je 1918. 
Fitzpatrick, H. M. The life history and parasitism of Eocronartium 
muscicola. Phytopathology 8: 197-218. pl. 1+ f. 1-4. 11 My 1918. 
Fletcher, S. W. Fragaria virginiana in the evolution of the garden 
strawberry of North America. Proc. Soc. Hort. Sci. 1915: 125-137- 
1916. Peas 
Fracker, S. B. Effect of crown gall on apple nursery stock. Phyto- 
pathology 8: 247. 11 My 1918. 
