374 BOTANICAL GAZETTE [NOVEMBER 
I gratefully acknowledge my indebtedness to Dr. C. B. Daven- 
PORT, under the inspiration of whose lectures this study was under- 
taken, and under whose direction it was largely carried on; to Miss 
Outve D. Cor for the care with which the material was collected, 
for the negatives from which jigs. 1, 4, and 5 were reproduced, and 
for the original of jig. 6; to the Directors of the U. S. Weather Bureau 
stations at Columbus, Ohio, and at Cincinnati, Ohio, for climato- 
logical data; and to the curators of numerous public and private 
herbaria for the data upon which jig. 3 is based. 
STATION FOR EXPERIMENTAL EVOLUTION, 
CoLp Sprinc Harpor, Long Island, N. Y. 
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