Volume LXVIII Number 6 



THE 



Botanical Gazette 



Editor: JOHN M. COULTER 



DECEMBER 1919 



Relative Transpiration of Coniferous and Broad-leaved Trees in Autumn 



and Winter - - - - - J- E- Weaver and A. Mogensen 393 



(With eighteen figures) 



Torsion Studies in Twining Plants H. V. Hendricks 425 



(With six figures) 



Early Development of Floral Organs and Embryonic Structures of 



Scrophularia marylandica - - ^- ' " ^- ^- ^'^^'*' 44i 



*^ (With Plates XXVn-XXIX) 



Companion Cells in Bast of Gnetum and Angiosperms - W. P. Thompson 451 



(With seven figures) 



Secretion of Amylase by Plant Roots - - L. Knudson and R. S. Smith 460 



(With two figures) 



Rav Tracheid Structure in Second Growth Sequoia washingtoniana 



■^ H. C. Belyea 407 



(With five figures) 



Perithecia with an Interascicular Pseudoparenchyma - F. L. Stevens 474 



(With Plate XXX) 



Current Literature 



------ 477 



Book Reviews - - - - ~ 



« - - - - 480 

 Notes for Students - - - - -» 



The University of Chicago Press 



CHICAGO, ILLINOIS, U.S.A. 



THE CAMBRIDGE UNIVERSITY PRESS, London 



THE MARUZEN-KABUSHIKl-KAISHA. Tokyo, Osaka. Kyoto. Fukuoka. Sendai 



THE MISSION BOOK COMPANY. Shanghai 



