VI 



CONTENTS [volume xlv 



BuiErER ARTICLES 



The physiological constants of plants commonly 



used in American botanical laboratories .- Sophia Eckersan 50 

 The condition of certain winter buds - - - 



William Moore and Mary E. Behney 54 



Notes on cleistogamy of grasses (with five figures) Agnes Chase 135 

 A new species of Achlya (with six figures) - 



W. C. Coker and /. Z?. Pemberion 194 



On the origin of angiosperms - - - - Hans Hallier 196 



The generic name of Goldmania - - • /. M, Greenman 198 



Lucien Marcus Underwood (with portrait) - - Editors 268 



A convenient traveling balance (with two figures)- W, W. Stockberger 269 

 The toxic action of certain plant constituents. — 



A correction - - - - - - -■ Editors 271 



Variations in Helianthus T. D. A. Cockerell 338 



Endosperm of Pontederiaceae (with four figures) - i?. Wilson Smith 338 

 An abnormal Porella platyphyUa (with three 



figures) -------- 



On the contents of the pollen chamber of a 

 specimen of Lagenostom<i ovoides (mth. two 

 figures) -----.-- 



The embryo of Ceratozamia. A physiological 

 study. Contributions from the Hull Botanical 



F, M. Andrews 340 



Margaret Benson 409 



Laboratory III (with seven figures) . - - Helen A. Dorety 412 



Current Literatttre ----- 55, 137^ i^g^ 272, 341, 417 



For titles of books reviewed see index under 



author's name and Re\ie 



ws - 



Xew 



Papers noticed in "Notes for Students" are m- 

 dexed under author's name and subjects. 



s 



72, 144, 216, 287, 360, 423 



DATES OF PUBLTCATIOX 



No. I, January 16; No. 2, February 15; No. 3, March 12; No. 4, April 14; 

 No. 5, Afay 15; No. 6, June 27. 



