INDEX TO AMERICAN BOTANICAL LITERATURE 455 
Dorsey, M. J. Relation of weather to fruitfulness in the plum. Jour. 
Agr. Research 17: 103-126. p!. 133-15 +f.1. 16 Je 1919. 
Drechsler, C. Cotyledon infection of cabbage seedlings by Pseudo- 
monas campestris. Phytopathology 9: 275-282. f. 1-6. Jl 1919. 
Drieberg, C. A freak papaw (Carica Papaya). Jour. Heredity. 
10: 207. 15 Jl 1919. 
Egan, W. C. The Russian May day tree: Prunus padus var. commu- | 
tata. Jour. Internat. Gard. Club 3: 277, 278. Je1g19.  [Illust.] 
Eikenberry, W. L. Some notes on the forests of Ogle County. Trans. 
Illinois Acad. Sci. §: 121-125. f. I. 2. 1912. 
Ekblaw, W. E. The plant life of northwest Greenland. Nat. Hist. 
19: 272-291. Mrigig._ [Illust.] 
Eldredge, A. G. Photographing flowers and insects. Trans. IIli- 
nois Acad. Sci. 9: 33-35. 1916. 
Fernald, M. L. Two new myriophyllums and a species new to the 
United States. Rhodora 21: 120-124. 19 Jl 1919. 
M. exalbescens and M. magdalense, spp. nov. 
Fred, E.B. The growth of higher plants in soils free of microdrganisms. 
Jour. Gen. Physiol. 1: 623-629. f. I-3. 20 Jl 1919. 
Fred, E. B., & Haas, A. R. C. The etching of marble by roots in the 
presence and absence of bacteria. Jour. Gen. Physiol. 1: 631- 
638. f. 1-3: 20 JL 1919. 
Fromme, F. D. Plant diseases in Virginia in 1915 and 1916. Ann. 
Rep. Virginia Agr. Exp. Sta. 1915 & 1916: 187-192. j. is. Je 
IQI7. 
Fromme, F. D., & Thomas, H. E. Black rootrot of the apple. Jour. 
Agr. Research 10: 163-174. pl. 15-17 +f. 1. 23 Jl 1919. 
Fuller, G. D. A comparison of certain Rocky Mountain grasslands 
with the prairie of Illinois. Trans. Illinois Acad. Sci. 8: 121-130. 
IQI5. 
Fuller, G. D. Evaporation and plant succession on the sand dunes of 
Lake Michigan. Trans. Illinois Acad. Sci. 4: 119-125. f. 2-4. 
IQII. 
Fuller, G. D. Germination and growth of the cottonwood upon the 
sand dunes of Lake Michigan near Chicago. Trans. Illinois Acad. 
Bei. §: .437--143.. f-. 2-6. . 1912; 
Fuller, G. D. Reproduction by layering in the black spruce. Trans. 
Illinois Acad. Sci. 6: 91, 92. 1913- 
