vi CONTENTS [volume liv 



PAGE 



The development of Blastocladia strangulata, n. sp. 



(with plates XVIII-XX) - J. T. Barrett 353 



The orchid embryo sac (with plates XXI-XXIII) Lester W. Sharp 372 



Growth studies in forest trees. 1. Pinus rigida 



Mill, (with plates XXIV and XXV) - - Harry P. Brcrwn 386 



Contributions from the Rocky Mountain Her- 

 barium. XII - - - - - - Avert Nelson 404 



Two species of Bowenia. Contributions from the 

 Hull Botanical Laboratory 162 (with four 

 figures) - - - - - - - - Charles J. Chamberlain 4 X 9 



Life history of Cutleria. Contributions from the 

 Hull Botanical Laboratory 163 (with fifteen 

 figures and plates XXVI-XXXV) - Shigeo Yamanouchi 44 * 



The nature of the absorption and tolerance of plants 



in bogs - Alfred Dachnowski 503 



Ingrowing sprouts of Solanum tuberosum (with 



plate XXXVI and six figures) - C. Stuart Gager 5 J 5 



The abortive spike of Botrychium. Contributions 



from the Hull Botanical Laboratory 164 



(with twenty-one figures) - O.O. Stoland 525 



Plants which require sodium (with two figures) - W. J. V. Osterhout S3 2 



Briefer Articles — 



Eduard Strasburger (with two portraits) Charles. J Chamberlain 68 

 A note on the generations of Polysiphonia 



(with one figure) - George B. Rigg and Annie D. Dalgity 164 

 Absorption of barium chloride by Aragallus 



Lamberti C. Dwight Marsh 250 



. Artificial production of aleurone grains (with 



one figure) - - W. P. Thompson 33 6 



A new species of Andropogon - - - A. S. Hitchcock 4 2 4 



Evaporation and the stratification of vegeta- 

 tion (with one figure) ----- George D. Fuller 4 2 4 



The perfect stage of the Ascochyta on the hairy 



vetch - - - - - George F. Atkinson 537 



Gautieria in the Eastern United States - - George F. Atkinson 53 8 



Current Literature 73, 166, 253, 339* 427> 54° 



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 15; No. 2, August 16; No. 3, September 21; No. 4, October 

 15; No. 5, November 13; No. 6, December 16. 



