192 INDEX TO AMERICAN BOTANICAL LITERATURE 
Jiennings|,O.E. Certain organic substances assimilated by Ceratodon 
purpureus. Bryologist 21: 86. 15 Ja 1919. 
Johnson, D.S. The fruit of Opuntia fulgida. A study of perennation 
and proliferation in the fruits of certain Cactaceae. I-62. pl. 
I-12 + frontispiece. 25 O 1918. 
Carnegie Inst. Washington, Publ. 269. ; 
Judd, C. S. The Hawaiian sumach. Hawaiian Forest. & Agr. 15: 
441, 442. N 1918. 
Kisselbach, T. A., & Ratcliff, J. A. Oats investigations. Nebraska 
Agr. Exp. Sta. Bull. 160: 1-48. f. 1-77. 15 N 1917. 
Knowlton, C. H., &! Deane, W. Reports on the flora of the Boston 
District,— X XVIII. Rhodora 20: 164-171. 4 S 1918;—XXIX. 
Rhodora 20: 208, 209. 27 Ja 1919. 
Knowlton, F. H. Note on a recent discovery of fossil plants in the 
Morrison formation. Jour. Washington Acad. Sci. 6: 180, 181. 
4 Ap 1916. 
Koch, G. P., & Butler, J. R. Cross-inoculation of aCe: Soil Sci. 
6: 397-403. _N 1918. 
Lauritzen, J.I. The relation of temperature and humidity to infection 
by certain fungi. Phytopathology g: 7-35. 20 Ja 1919. 
Lee, H. A. Further data on the citrus canker affection of the citrus 
species and varieties at Lamao. Philip. Agr. Rev. 11: 200-206. 
pl. 9-15. 1918. 
Leén, H. Las exploraciones bocigicas de Cuba. Resefia comparativa 
de la contribucién du Dr. N. L. Britton y de los botAnicos an- 
teriores, al conocimiento de la flora Cubana. Mem. Soc. Cubana 
Hist. Nat. ‘Felipe Poey’’ 3: 178-224. 1918. [Illust.] 
Lunnell, J. Enumerantur plantae Dakotae septentrionalis vasculares 
—XIV. Am. Mid. Nat. 5: 233-241. N 1091 
Lutman, B. F. Apple diseases and their control. Vermont Comm. 
Agr. Rept. 9: 67-70. 1918. 
Lutman, B. F. Blight disease of potatoes. Ann. Rept. Vermont 
Hort. Soc. 13: 55-60. 1916. 
MacCaughey, V. An ecological survey of the Hawaiian Pteridophytes. 
Jour. Ecol. 6: 199-219. N 1918. 
MacKay, A. H. The phenology of Nova Scotia, 1916. Trans. Nova 
Scotian Inst. Sci. 14: 147-154. 1 Au 1918. [lIllust.] 
Massey, L. M. More about rose Pees Am. Rose Ann. 1918: 
63-71. ph. 4+ f. 7. 1918: 
