Vol. VI. JULY, 1919 No. 7 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
*4^^ * ^^^^ 
CONTENTS ■ M u s 
The stiucture of protoplasm R, A, HarpeIi 273 
George Francis Atkinson. 
W, G. Farlow, Roland Thaxter, and L. H. Bailey 301 
Publications of George Francis Atkinson Harry^M. Fitzpatrick 303 
Viability of detached root-cap cells . . . . . . . . .... . . L. Knudson 309 
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, 1879 
