Vol. II 
MAY, 1915 
No. 5 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
The morphology and systematic position of Podomitrium. 
Douglas Houghton Campbell 199 
On the relation of root growth and development to the temperature and 
aeration of the soil W.A.Cannon 211 
The anatomy of a hybrid Equisetum. Ruth Holden 225 
Some features in the anatomy of the Malvales C. C, Forsaith 238 
The absorption of ions by living and dead roots H. V. Johnson 250 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa. 
Entered as second-class matter February 21, 19x4, at the post office at Lancaster, Pennsylvania, 
under the act of March 3, 1879. 
