THE 
BoTANICAL GAZETTE 
April roro 
Editors: JOHN M. COULTER and CHARLES R. BARNES 
: CONTENTS 
: 
; The Cell Structure of Closterium Ehrenbergii and Clos- 
E terium moniliferum B. F. Lutman 
= 
Climatology and Vegetation in Colorado W. W. Robbins 
The Floral Development and eee pies of Eriocaulon 
septangulare R. Wilson Smith 
The Closing Response in Dionaea 
William H. Brown and Lester W. Sharp 
Briefer Articles . 
An Abnormal Bract-Modification in Cotton H. W. Allard 
The Biological Antagonism between Calcium and Magnesium 
= Oscar Loew 
Current Literature 
The University of Chicago Press 
CHICAGO and NEW YORE 
William Wesley and Son, London 
