vi 3 CONTENTS [VOLUME 
‘The influence of tension on the formation of mechani- 
cal tissue in plants - Rujus Percwval Hibbard 
Periodicity in the Seo iaciion of the ial cells of 
Dictyota dichotoma (with two figures) - ‘W. D. Hoyt 
The function of invertase in the formation of cane and 
invert sugar dates - A. E. Vinson 
New or noteworthy North Aneta | Convolvulaceae 
(with four figures)  - - - - Homer D. House 
BRIEFER ARTICLES— 
Illustrating botanical papers - - - €. 
Preliminary note on Ceratozamia __- - Charles BA Chaetael 
Characters of Pinus: The lateral cone (with two 
figures) - George Russell Shaw 
The genus Aludhs in North Bekots with one 
figure) - J. Lunell 
New normal appedintices for use in plant physiol 
ogy. IV (with two figures) - W. F. Ganong 
Is this birch new? (with one figure) - - - Aven Nelson 
Rhododendron albiflorum with double flowers _- Aljred Rehder 
Puccinia upon Melothria sca one ee, - F. L. Stevens 
An instance of mutation - T. D. A. Cockerell 
Linnaeus (with two portraits) - Theo. Holm 
The organization of the tisloetial 4, eas ees 
of the physiological life-histories of plants” - W. F. Ganong 
Heterothallism in the bread mold, Seip: 
nigricans A. F. Blakeslee 
Two embryo-sa actike nih in Lilium Sires: 
um - Margaret C. Ferguson 
CURRENT Lavoe - 
For titles of books sevice see side inde 
author’s name and Reviews. 
Papers noticed in “Notes for Students” are in- 
dexed under author’s name and subjects. 
XLIII 
418 
~ 64, 138, 214, 285, 345, 420 
NEws - - - - - - - - - 80, 152, 232, 296, 358, 424 
DATES OF PUBLICATION 
1, January 24; No. 2, ered 16; No. 3, March 20; No. 4,%April 15; 
No. 
No. 5, wee 16; No. 6, tours 
