Vol. IV. 
APRIL, 1917 
ITo. 4 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
The relation of some rusts to the physiology of their hosts. E. B. Mains 179 
The development of some species of Agaries A. W. Blizzard 221 
The origin and development of the galls produced by two cedar rust fungi. 
J. L. Weimer 241 
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. 
