INDEX TO VOLMUE THIRTEEN. 



Andrews, F. M. — The Botanical Garden of the University of Amster- 

 dam 53 



Babcock, Ernest B. — Teratology in Juglans Californica Wats 2 7 



Barnes, P. T. — The String-Bean Man and his Work 299 



Blumer, J. C. — An Animal Factor in Plant Distribution 16 



Fire as a Biological Factor 42 



A Comi)arison Between Two Mountain Sides 134 



Mistletoe in the Southwest 240 



Notes on Growth of Pine Seedlings 296 



Brown, Wm. H. — Evaporation and Plant Habitats in Jamaica 268 



Cannon, W. A. — Travel Notes: Rural England 259 



Cardiff, Ira D. — An Aberrant Walnut 82 



Fink, Bruce. — A Manual of California Lichens 229 



Gates, Frank C. — Some Effects of Protracted Drought upon Xero- 



phylic Plants 298 



Gruenberg, Benj. C. — Feklo's Work with Mycorrhiza 18 



Hall, H. M. — A New Rocky Mountain Botany 96 



Barter, L. L. — The Starch Content of Leaves Dropped in Autumn. . 144 



Hawkins, Lon A. — The Porous Clay Cup for the Automatic Water- 

 ing of Plants 220 



Herre, Albert C. — Origin of California Lichen Flora 215 



Lichens of Minnesota 249 



Howe, R. Eeber. — Effect of Moisture on the Growth of Useneas . ... 68 



Livingston, B. E. — A Rain-Correcting Atmometer for Ecological 



Instrumentation "9 



Opeiation of the Porus Cup Atmometer Ill 



MacDougal, D. T. — DeVries' Mutation Theory 109 



The Making of Parasites 207 



Pammel, L. H. — Rocky Mountain Rambles 155, 181 



Parish, S. B. — A New Flora of California 14 



Mutation in the Oenotheras 66 



Two New Zealand Botanical Reports 140 



The Effect of Cement Dust on Citrus Trees 288 



Peace, L. M. — Clearing and Staining Leaves and Stems 93 



Peirce, G. J.— "The Teaching Botanist" 272 



An Effect of Cement Dust on Orange Trees 283 



Phillips, Frank J. — Teratology of the Banana 22 7 



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