138 INDEX TO AMERICAN BOTANICAL LITERATURE 
Mabbott, D.C. Food habits of seven species of American shoal-water 
ducks. U.S. Dept. Agr. Bull. 862: 1-67. 30 D 1920 
Contains accounts of plants eaten by ducks. 
MacDougal, D. T. The construction of a biocolloid exhibiting some 
of the water-relations of living plants. Carnegie Inst. Washington 
Year Book. 16: 59, 60. 1917. 
MacDougal, D. T. Growth of wheat (Triticum) and Corn (Zea). 
Carnegie Inst. Washington Year Book 16: 85-87. 1917. 
MacDougal, D. T. Imbibition in biocolloids as affected by acidosis, 
alkalosis, and neutralization. Carnegie Inst. Washington Year 
Book 16: 60-62. 1917. 
MacDougal, D. T. The physical basis of parasitism. Carnegie Inst. 
Washington Year Book 16: 71-73. 1917. 
MacDougal, D. T. Rate and course of growth of succulents. Cars 
negie Inst. Washington Year Book 16: 83-85. 1917. 
Mackenzie, K. K. Scientific names applicable to our purple-flowered 
Eupatoriums. Rhodora 22: 157-165. 7 D 1920. 
Mackie, W. W., & Briggs, F. N. Fungicidal dusts for control of smut. 
Science I]. 52: 540, 541. 3 D 1920. 
Magalhaes, B. de. Antonio Luiz Patricio da Silva Manso. Arch. 
Mus. Nac. Rio Janeiro 22: 79-96. 1919. 
Marie-Victorin, Fr. Le ‘‘ Micrampelis lobata.’ Nat. Canad. 46: 
172-174. F 1920. 
Marie-Victorin, Fr. La vie sexuelle chez les Hydrocharitacées. Nat. 
Canad. 45: 130-133. Mr 19109. 
Maxon, W. R. New selaginellas from the western United States. 
Smithson. Misc. Coll. 72°: 1-10. pl. 1-6. 22 D 1920. 
Includes 6 new species. 
Mayhew, I. P. Winter flowers in Massachusetts. Am. Bot. 26: 
140, 141. N 1920. 
McGee, J. M. Experiments upon the imbibitional swelling of marine 
algae. Carnegie Inst. Washington Year Book 16: 64, 65. 1917. 
McLarty, H. R. A suspected mosaic disease of sweet clover. Phy- 
topathology 10: 501-503. f. 3. 1920. 
McMurran, S. M., & Demaree, J. B. Diseases of southern pecans. 
U.S. Dept. Agr. Farmers’ Bull. 1129: 3-22. f. 1-2 sc S TG20, 
Merrill, E. D. Notes on Philippine Euphorbiaceae. Philipp. Jour. 
Sci. 16: 539-579. Je 1920. 
