vi CONTENTS [VOLUME LII 
Physiological behavior of enzymes and carbo- 
hydrate transformations in after-ripening 
of the potato tuber. Contributions from the 
Hull Botanical Laboratory 148 - - ~~ - Charles O. Appleman 
Reversible sex-mutants in — dioica (with 
fifteen figures) - - - - George Harrison Shull 
Reduction by layering among conifers. Con- 
tributions from the Hull Botanical Labora- 
tory 149 (with one figure) - - - - William S. Cooper 
The endosperm of angiosperms. Contributions 
from the Hull Botanical Laboratory aed - John M. Coulter 
Some problems in cecidology- - - - Mel T. Cook 
An electrical constant temperature ane. 
Contributions from the Hull Botanical Labora- 
tory 151 (with four figures) - - W. J. G. Land 
Light at and sac aurea ‘(with one 
figu Burton Edward Livingston 
The ik sac of Epipocis (with ole X) 
William H. Brown and Lester W. Sharp 
The oxygen minimum and the germination o 
Xanthium seeds. Contributions from . 
Hull Botanical aig seine — icici on 
figure) - - Charles Albert Shull 
BRIEFER kigtee f 
Edward Palmer (with portrait) - W. E. Safford 
Dehydrating with alcohol (with ae heures) W. A. Wullschleger 
Is Ophioglossum palmatum anomalous? - - M. A. Chrysler 
Cryptomeria japonica (with four figures) - Ansel F. Hemenway 
An imbedding medium for brittle or — 
tissues - H. M. Benedict 
Apogamy in Pdllaes ouuehus W. N. Steil 
A ease oan of ipo (with one 
gure - W. J. G. Land 
CURRENT trees - - - - - 6, 155, 233, 316, 402, 
For titles of book reviews see index under 
author’s name and reviews 
Papers noticed in “Notes for Students” are 
indexed under author’s name and subjects. 
DATES OF PUBLICATION 
No. 1, July 17; No. 2, August 18; No. 3, September 15; No. 4, October - 
17; No. 5, November 15; No. 6, December 19. 
PAGE 
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153 
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478 
480 
