Vol. V. 
NOVEMBER, 1918 
No. 9 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
Calcium oxalate in the dasheen . , O. F. Black 447 
The influence of certain added solids upon the composition and efficiency of 
Knopfs nutrient solution. . , . . .E. H. Toole and W. E. Tottingham 452 
Uredinales of Guatemala based on collections of E. W. D. Holway. III. 
Puccinia, exclusive of species oh Carduaceae. J. G. Arthur 462 
On the osmotic concentration of the tissue fluids of phanerogamic epiphytes 
J. Arthur Harris 490 
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 ofSce at Lancaster, Pennsylvania, 
under the act of March 3,1 879. 
