258 INDEX TO AMERICAN BOTANICAL LITERATURE 
Koehne, E. Maddenia. In Sargent, C. S., Plantae Wilsonianae I: 
56-59. 31 Jl 1911. 
Koehne, E. Philadelphus. In Sargent, C. S., Plantae Wilsonianae 1: 
4-6. 31 Jl 1911; 1: 145. 30 Ap 1912. 
Koehne, E. Sorbus. In Sargent, C. S., Plantae Wilsonianae I: 457- 
484. 15 My 1913. 
Lecomte, H. Loranthaceae. In Sargent, C. S., Plantae Wilsonianae 
3: 315-319. 31 Au 1916. ; 
Levin, I., & Levine, M. Malignancy of the crown-gall and its analogy 
to animal cancer. Jour. Cancer Research 5: 243-260. f. I-15. 
1920. 
Lingelsheim, A. Fraxinus. In Sargent, C. S., Plantae Wilsonianae 2: 
258-262. 24 Mr 1914. 
Lintl,H. Echinopsis multiplex. Monatsschr. Kakteenk. 27: 123, 124. 
Au 1917. 
Loesener, T. Aquifoliaceae. In Sargent, C. S., Plantae Wilsonianae 
™ Br 7h-Ba.° ar JL ror: 
Loesener, T., & Rehder, A. Celastraceae. In Sargent, C. S., Plantae 
Wilsonianae 1: 485-487. 15 My 1913. 
Loftfield, G. V. Behavior of stomata. Carnegie Inst. Washington 
Year Book 19: 343, 344. 3 F 1921. 
Lutz, F. E. Geographic average, a suggested method for the study of 
distribution. Am. Mus. Novit. 5: 1-7. 14 Mr 1921. 
MacDougal, D. T. Biological and physical factors affecting plants in 
new habitats. Carnegie Inst. Washington Year Book 19: 69-71. 
3 F 1921. 
MacDougal, D. T. Course of growth in trees as measured by the 
dendrograph. Carnegie Inst. Washington Year Book 19: 49, 50. 
3 F 1921. 
MacDougal, D. T. Growth and the accumulation of reserve material 
as measured in the potato. Carnegie Inst. Washington Year Book 
10: Si, 3 F 1641: 
MacDougal, D. T. Measurement of a season’s growth of trees by the 
newly designed dendrometer. Carnegie Inst. Washington Year 
Book 19: 50. 3 F 1921. 
MacDougal, D. T., & Spoehr, H. A. Components and colloidal be- 
havior of plant protoplasm. Carnegie Inst. Washington Year 
Book 19: 53-57. 3 F 1921. 
