LIV 



No. 2 



THE 



August 1912 



Editor: JOHN M. COULTER 



CONTENTS 



Spermatogenesis in Equisetum 





Lester W. Sharp 



The Primary Color-Factors of Lychnis and Color-Inhibitors 



of Papaver Rhoeas 



George Harrison Shull 



Contributions from the Rocky Mountain Herbarium. XI 



Aven Nelson 



Beneficial Effect of Creatinine and Creatine on Growth 



J. J. Skinner 



Briefer Articles 



A Note on the Generations of Polysiphonia 



George B. Rigg and Annie D. Dalgity 



Current Literature 



The University of Chicago Press 



CHICAGO, ILLINOIS 



Agents 

 AMBR1DGE UNIVERSITY PRESS, London and Edinburgh 



WILLIAM WESLEY & SON, London 



T*L STAUFFER, Leipzig 

 MARUZEN KABUSHIKi -KAISHA. Tokyo. Otoka, Kyoto 



