Volume LXVIII Number 3 



THE 



Botanical Gazette 



Editor: JOHN M. COULTER 



SEPTEMBER 1919 



Phytogeography of the Eastern Mountain-Front in Colorado. I. Physical 

 Geography and Distribution of Vegetation. Contributions from the 

 Hull Botanical Laboratory 251 - - - - Arthur G. Vestal 153 



(With seventeen figures) 



On Nitrification. IH. The Isolation and Description of the Nitrite 



Ferment -------- Augusto Bonazzi 194 



iWith Plate XIV) 



Polyxylic Stem of Cycas media. Contributions from the Hull Botanical 



Laboratory 252- - - - - - - Ward L. Miller 208 



(With eleven figures) 



A Parasite of the Tree Fern (Cyathea) - F. L. Stevens and Nora Dalbey 222 



(With Plates XV, XVI) 



Anatomy of Lycopodium refiexum - - - - - J. Ben Hill 226 



(With five figures) 



Current Literature 



Notes for Students - - - - - - - - -232 



The University of Chicago Press 



CHICAGO, ILLINOIS, U.S.A. 



THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 



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



THE MISSION BOOK COMPANY. Shanghai 



