118 INDEX TO AMERICAN BOTANICAL LITERATURE 
MacDougal, D. T. Growth in trees. Proc. Am. Philos. Soc. 
OO: Pri4. pF +f. 3-5. 921. 
MacDougal, D. T. The action of bases and salts on biocolloids 
and cell-masses. Proc. Am. Philos. Soc. 60: 15-30. I92I. 
MacDougal, D. T., & Working, E.B. Another high- Bas apie 
record for srt and endurance. Science II. 54: 152, 
153. I9 Au 1921. 
McMurray, N. Freak dogwood. Am. Bot. 27: 113. Au 1Ig2l. 
MacTaggart, A. The influence of certain fertilizer salts on the 
growth and nitrogen-content of some legumes. Soil Sci. 
11: 435, 454. pl. z. Je Iga. 
Meier, H. F. A. Effect of direct current on cells of root tip of 
Canada field pea. Bot. Gaz. 72: 113-138. pl. 2-3 + f. 1-3. 
15 S 1921. 
Moodie, R. L. Bacteria in the American Permian. Science II. 
54: 194-196. 2S 1921. 
Mottier,D.M. On certain plastids, with special reference to the 
protein bodies of Zea, Ricinus, and Conopholis. Ann. Bot. 
35: 349-364. pl. 15. Jl gat. 
[Nicholls, H. A. A.] Useful timbers of Dominica. In Bell, H. 
H., Notes on Dominica and hints to intending settlers. 
34-56. 1919. [Illust.] 
Nichols, G.E. The vegetation of Connecticut. VII. The asso- 
ciations of depositing areas along the seacoast. Bull. 
Torrey Club 47: 511-548. f. 1-ro. 24 N 1920. 
Oakley, R.A. Effect of the length of day on seedlings of alfalfa 
varieties and the possibilities of utilizing this as a practical 
means of identification. Jour. Agr. Research 21: 599-607. 
pl. 111-121. 15 Jl 1921. 
Overton, J.B. The mechanism of root pressure and its relation 
to sap flow. Am. Jour. Bot. 8: 369-374. Jl 1921. 
Pack, D. A. Chemistry of after-ripening, germination and seed- 
ling development of juniper seeds. Bot. Gaz. 72: 139- 
150.- 1§ S 102i. i 
Pellett, F. C. American honey plants. pps. 1-297. f. I-I§2. 
1920. 
Pennington, L. H., & others. Investigations of Cronartium 
ribicola in 1920. Phytopathology 11: 170-172. Ap 192I. 
