66 INDEX TO AMERICAN BOTANICAL LITERATURE 
Ashe, W. W. Additions to the arborescent flora of North Carolina. 
Jour. Elisha Mitchell Sci. Soc. 34: 130-140. S 1918. 
Includes A melanchier austro-montana sp. nov. and many new combinations. 
Bailey, I. W., & Tupper, W. W. Size variation in tracheary cells: I. 
A comparison between the secondary xylems of vascular Crypto- 
gams, Gymnosperms and Angiosperms. Proc. Am. Acad. Arts and 
Sci. §4: 149-204. f. -6. S$ 1918. 
Beals, C. C. The effect of aeration on the roots of Zea Mays—l. 
Proc. Indiana Acad. Sci. 1917: 177-180. f. 1-3. 1918. 
Bicknell, E. P. Aster laevis. Addisonia 3: 47, 48. pl. 104. S 1918. 
Blake, M. A. Distribution of peach yellows in nursery stock. Proc. 
Soc. Hort. Sci. 1910: 46-51. Ap I9gII. 
Blake, M. A. Factors which determine color in the forcing of roses. 
Proc. Soc. Hort. Sci. 1910: 19-27. Ap 1911. 
Britton, N. L. Byron David Halsted. Jour. N. Y. Bot. Gard. 19: 
221. S 1918. 
Britton, N. L. Opuntia Opuntia. Addisonia 3: 49, 50. pl. 105. S 
1918. 
Brown, E. W. Regeneration in Phegopteris polypodioides. Bull. 
Torrey Club 45: 391-397. f. 1-3. 19 O 1918. 
Brown, W. H. The fungi cultivated by termites in the vicinity of - 
Manila and Los Bafios. Philip. Jour. Sci. 13: (Bot.) 223-231. 
O44. TAGs. 
Cockerell, T. D. A. Notes on the flora of Boulder County, Colorado. 
Torreya 18: 177-183. 29 O 1918. 
Coit, J. E. The brown spot of the navel orange. Proc. Soc. Hort. 
Sci. 1910: 62-67. Ap IgIt. 
Coker, D. Revision of the North American species of Encalypta. 
Bull. Torrey Club 45: 433-449. pl. 13, 14. 15 N 1918. 
Coker, W. C. A visit to Smith Island. Jour. Elisha Mitchell Sci. 
Soc. 34: 150-153. pl. 10-16. S$ 1918. 
Cowgill, H. B. Cross-pollination of sugar cane. Jour. Am. Soc. 
Agron. 10: 302-306. N 1918 
Crandall, C. S. The vitality of pollen. Proc. Soc. Hort. Sci. 1912: 
121-130. Mr 1913. 
Dixon, H. N. Uganda mosses collected by R. Diimmer and others. 
Smithsonian Misc. Col. 69: 1-10. pl. 7. 21 O 1918. 
Eight new species in various genera are described. 
