ae ae ee 
Volume LVII Number 4 i 
THE 
BoTANICAL GAZETTE 
Editor: JOHN M. COULTER 
ar 
APRIL 1014 
2 
The Effect of Shading on the Transpiration and Assimilation 
of the Tobacco Plant in Cuba Heinrich Hasselbring 
A Preliminary Inquiry into the Significance of Tracheid- 
Caliber in Coniferae Percy Groom 
Note on the Ascosporic Condition of the Genus Aschersonia 
Montagne Roland Thaxter | 
Morphological Instability, Especiaffy in Pinus radiata 
Francis E. Lioyd 
Life History of Porella platyphylla Florence L. Manning 
The Effect of Climatic Conditions on the Rate of Growth of 
Date Palms A. E. Vinson 
Briefer Articles 
The Type Species of Danthonia A. S. Hitchcock 
A Method of Handling Material to Be Imbedded in Paraffine . 
Elda R. Walker 
E. M. East 
A Correction 
Current Literature 
The University of Chicago Press 
3 CHICAGO, ILLINOIS, U.S.A. 
