THE PLANT WORLD 



INDEX TO CONTENTS OF VOLUME TWENTY, 1917 



Aase, H C. Megasporophylls of Conifers; Review 263 



Absorption and Secretion. -M. H. Fischer; Review 393 



Absorption of Carbohydrates by Green Plants. L. Knudson; 



Review 29 



Adkmson, J., et al. Dicotyledonous Woods; Review 191 



American Journal of Forestry; Note 66 



Around the Year in the Garden. F. F. Rockwell; Note 339 



Artificial Osmotic Cell, Observations on a New Type of. J. 



Rosett 37 



Atkins, W. R. G. Experimental Results in Plant Physiology; 



Review 224 



Beginnings and Physical Basis of Parasitism. D. T. MacDougal. 238 



Berry, E. W. History of the Willows and Poplars 16 



Berry, E. W. Wilcox Flora; Review 127 



Bews, J. W. Growth Forms of Natal Plants; Review 299 



Boerker, R. H. Germination and early Growth of Forest Trees; 



Review 64 



Book of Forestry. P. F. Moon; Review 262 



Bowman, Isaiah. Peruvian Andes; Review 129 



Braun, E. Lucy. Vegetation of Conglomerate Rocks of the Cin- 

 cinnati Region 380 



Brooklyn Botanic Garden; Note 161 



Calvert, A. S., and Calvert, P. P. Natural History of Costa 



Rica ; Review 395 



Cannon, W. A. Rate of Growth of Prosopis is Relation to 



Soil Temperature 320 



Chamberlain, C. J. Prothallia of Lycopodiiim; Review 225 



Climatic Conditions as related to Plant Growth. F. T. McLean; 



Review 158 



Comparative Length of Growing Season of Woods. F. W. Haasis 354 



Cooper, W. S. Redwoods, Rainfall, and Fog 179 



Cowles, H. C, and Fuller, G. D. Work of; Note 364 



Cribbs, J. E. Plant Associations of Western Pennsylvania .. . 97, 142 



Critical Temperatures for Phytolacca. F. E. Lloj^d 121 



Dice, L. R. Work of; Note 95 



Dicotyledonous Woods. J. Adkinson et al. ; Review 191 



Distillation of Wood; Note 161 



Doctorates in Botany; Note 32 



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