INDEX TO AMERICAN BOTANICAL LITERATURE 345 
Demerec, M. Heritable characters of maize. X. Zebra striped 
leaves. Jour. Hered. 20: 406, 407. f. 12. N 1921. 
Denison, I. A. The nature of certain aluminum salts in the 
soil and their influence on ammonification and nitrification. 
Soil Sci. 13: 81-106. F 1922. 
Denny, F. E. Formulas for calculating number of fruits re- 
quired for adequate sample for analysis. Bot. Gaz. 73: 
44-57...18 Ja 1922. 
Detwiler, S. B. Blister rust appears in the Puget Sound region. 
Am. For. 28: 97, 98. F 1922. 
Dietel, P. Zur Umgrenzung der Gattung Pileolaria Cast. Ann. 
‘Mycol. 19: 300-303. 1921. 
Dodge, C.K. Miscellaneous papers on the botany of Michigan. 
Michigan Geol. & Biol. Surv. 31: 15-234. 1921. 
Plant lists.of various sections of state. Includes biography, portrait 
and map. 
Dunbar, J. How to grow ee Jour. New York 
Bot. Gard. 22: 184-190. 1921 
Durand, E.J. The genus Catinella. Bull. Torrey Club 49: 15-21. 
21 Mr 1922. 
Dwight, T. W. Timber administration of the Dominion Forest 
Service. Jour. Forestry 20: 4-9. Ja 1922. 
Elliott, C. Sterility of oats. U.S. Dept. Agr. Bull. 1058: 1-8. 
pl. I-4. 6 Mr 1922. 
Emerson, R. A. The nature of bud variations as indicated by 
their mode of inheritance. Am. Nat. 56: 64-79. F 1922. 
Emerson, R. A., & Hutchinson, C. B. The relative frequency 
of crossing over in microspore and in megaspore develop- 
ment in maize. Genetics 6: 417-432. S 1921. — 
Eriksson, I. The life of Puccinia Malvacearum Mont. within 
the host plant and on its surface. Phytopathology 11: 459- 
463. 25 F 1922. 
Ezekiel, W. N. Some factors affecting the production of 
apothecia of Sclerotinia cinerea. Phytopathology 11: 495- 
499. 21 Mr 1922. 
