THE PLANT WORLD 



INDEX TO CONTENTS OF VOLUME TWENTY-ONE, 1918 



Algal and Bacterial Flora of Japanese Water Systems. H. Hat- 

 tori ; Review 136 



Allen, C. E. and Gilbert, E. M. Text-book of Botany; Review. . 216 



Atlas of American Agriculture; Note 331 



Baker on Oneida Lake ; Note 244 



Berry, E. W. Geologic History of the Locust and its Allies 284 



Berrv, E. W. History of the Linden and Ash 163 



Botanical Abstracts; Notes 23, 105, 244 



Botany of Crop Plants. W. W. Robbins: Review 104 



Britton, on Flora of Bermuda; Note 56 



Buchholz, J. T. Embryology of Pinus ; Review 330 



Calldns, G. N. New Biological Text; Review 69 



Cannon, W. A. Evaluation of the Soil Temperature Factor in Root 



Growth 64 



Carbohydrate Metabolism of the Sweet Potato. Heinrich Hassel- 



brina: : Review 262 



Civic Biology. C. F. Hodge and Jean Dawson; Review 261 



Classification of Symbiotic Phenomena. W. B. McDougall 250 



Clements, F. E. Plant Succession; Review 47 



Climate and Plant Growth. A. W. Sampson; Review 300 



Colloidal Hypothesis of Protoplasmic Permeability. E. E. Free . . 141 



Conzatti on Vegetation of Oaxaca; Note 189 



Cooperative Work on Plant Cultures; Note 264 



Culture of Mistletoes. J. R. Weir; Review 159 



Development of Two Plant Associations of Northern Michigan. 



H. A. Gleason 151 



Doctorates in Botany in 1917; Notes 70, 138 



Dune Vegetation at San Francisco, California. Francis Ramaley . . 191 



Dynamic Studies of Long Island Vegetation. R. M. Harper 38 



Eastern National Forests; Note 138 



Ecology of Prairie and Woodland. J. E. Weaver and A. F. Thiel; 



Review 68 



Effect of Bog and Swamp Waters on Swelling in Plants and in Bio- 

 colloids. D. T. MacDougal 88 



Effect of Ions of NaCl and CaCl2 upon the Conductivity of Col- 

 loidal Mixtures. N. B. Green 303 



Embryology of Pinus; J. T. Buchholz; Review 330 



Endemic Palms of Hawaii : Pritchardia. Vaughan MacCaughey . . 317 

 Evaluation of the Soil Temperature Factor in Root Growth. W. 



A. Cannon 64 



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