V01.X 
1 /'.V. ‘v 
JULY, 1923 
No. 7 
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OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
C. Sands 343 
The effect of ringing a stem on the upward transfer of nitrogen and ash constituents. 
Otis F. Curtis 361 
The influence of plants on the air in houses. 
George B. Rigg, Thomas G. Thompson and William L. Gilliland 383 
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The potentialities of a cell ... Charles E. Allen 387 
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PUBLISHED 
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IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE , ’ \ 
BROOKLYN BOTANIC GARDEN 
At Prince and Lemon Sts., Lancaster, Pa. 
LONDON AGENTS 
WHELDON AND WESLEY, Ltd. 
2, 3, & 4 Arthur Street, London, W. C. 2 
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Entered as second-class matter February 21,1914, at the post office at Lancaster, Pa., under the act of March 3» 1879 
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