Vol. V. 
DECEMBER, 1918 
No. 10 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
Endurance of extreme conditions and its relation to the theory of adaptation 
W, J. V. OSTERHOUT 507 
A simple method of demonstrating the production of aldehyde by chlorophyll 
and by aniline dyes in the presence of sunlight. . .W. J. V. Osterfout 511 
Oreomyrrhis borneerisis Merr. sp. nov., an interesting addition to our knowl- 
edge of the Malayan flora. .E. D. Merrill 514 
Root absorption from solutions at minimum concentrations 
R. B. Harvey and R. H. True 516 
Uredinales of Guatemala based on collections of E. W. D. Holway. IV. 
Puccinia on Carduaceae, form-genera and index ....... .J. C. Arthur 522 
Index to Volume V ; 551 
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, 1914, at the post office at Lancaster, Pennsylvania^ 
under the act of March 3,1 879 
