_ BOTANICAL GAZETTE 
November roxrr 
CONTENTS 
Reversible Sex-Mutants in Lychnis dioica George Harrison Shull 
Reproduction by Layering among Conifers William S. Cooper 
The Endosperm of Angiosperms John M. Coulter 
Some Problems in Cecidology Mel T. Cook 
An Electrical Constant Temperature Apparatus W- J. G. Land 
Briefer | Articles 
Apogamy in Pellaea atropurpurea W. N. Steil 
Current Literature 
The University of Chicago Press 
CHICAGO, ILLINOIS 
Agents 
‘THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 
_ WILLIAM WES WESLEY &: SON, London i 
TH. STAUFFER, Leipzig ¥ 
- THE _ MARUZEN-KABUSHIKL-KAISHA, Tokyo, Osaka, Kyoto 
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