Vol. n 
FEBRUARY, 1915 
No. 2 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
Some effects of the brown-rot fungus upon the composition of the peach. 
LoN A. Hawkins 71 
Negative heliotropism of urediniospore germ tubes F. D. Fromme 82 
A woody stem in Merremia gemella induced by high warm water. 
Frank C. Gates 86 
Picro-nigrosin, a Combination fixative and stain for algae. 
Otis^. Curtis and Reginald H. Colley 89 
Normal and abnormal permeability , W. J. V. Osterhout 93 
A simplified precision auxanometer W. T. Bovie 1 95 
The mutations of Oenothera stenomeres .H. H. Bartlett 100 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETTY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa. 
Entered as second-class matter February at. X914. at the post office at Lancaster. Pennsjrivania. 
under the act of Marcli 3, 1879. 
