218 INDEX TO AMERICAN BOTANICAL LITERATURE 
Lee, H. A. Gum diseases of sugar cane in the Philippines. 
Phytopathology 13: 504. 9 N.1923. 
Lewis, F. J., & Tuttle, G. M. On the panini attending 
seasonal changes in the organization in leaf cells of Picea 
canadensis (Mill.) B. S. P. New Phytol. 22: 225-232. 
1 D 1923. 
Longley, A. E. Cytological studies in the genera Rubus and 
Crataegus. Am. Nat. 57: 568, 569. D 1923. 
Lund, E. J. Electrical control of organic polarity in the egg of 
Fucus. Bot. Gaz. 76: 288-301. pl. 27 + f.1,2. 10D 1923. 
Lutman, B. F. Further observations on the osmotic pressure 
of the juices of the potato plant. Jour. Agr. Research 26: 
243-256. . 10 N: 1923. 
Mackay, A.H. Diatoms of Nova Scotia; collected by Alexander 
Howard Mackay and determined, distributed and lists 
published by J. Tempére and H. and M. Peragallo, Paris, 
France. . Proc. & Trans. Nova Scotia Inst. Sci. 15: 175- 
foo, yn toes, 
Mackay, A. H. The ohenpiogyof Nova Scotia, 1920. Proc. 
& Trans. Nova Scotia Inst. Sci. 15: 153-160. 1 N 1923. 
Mackay, A. H. The phenology of Nova Scotia, 1921. Proc. 
& Trans. Nova Scotia Inst. Sci. 15: 189-196. 1 N 1923. 
Mackenzie, K. K. Notes on Carex—XIII. Bull. Torrey 
Club 50: 343-358. 1 D 1923. 
Includes Carex plana, sp. nov., from New York, and C. ee sp. 
nov., from Pennsylvania. 
McKinney, H. H. Influence of soil temperature and moisture 
on infection of wheat seedlings by Helminthosporium 
sativum. Jour. Agr. Research 26: 195-218. pl. 1-4. 
1923. 
Mamelide Calvino, E. The direct assimilation of free nitro- 
gen by plants. Torreya 23: 99-104. D- 1923. 
Menaul, P. A chemical analysis = Jatropha mieouaneaee a 
Agr. Research 26: 259, 260.. 10 N 1923... 
