Vol. IX. 
MARCH, 1922 
No. 3 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
ITiidercoolmg of peach buds ; Earl S. Johnston 93 
Significance of the behavior of sensitive stigmas, F, C. Newcombe 99 
The relation of age to size in certain root cells and in vein-islets of the leaves 
of Salix nigra Marsh , Marjorie A. Tellefsen 121 
The origin of new varieties of Nephrolepis by orthogenetic saltation II. 
Regressive variation or reversion from the primary and secondary sports 
of bostoniensis , R. C. Benedict 140 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, t*A. 
Eutared as Moond-claw matter February 21, 1914, at the post ofhct at Lancaftter, Pennsy^vani-a, 
under the act of March 3, 1879 
