Gbe Botanical (5a3ette 



a dfcontbtB Journal Embracing all Departments ot UBotanfcal Science 



Edited by John M. Coulter, with the assistance of other members of the botanical staff of the 



University of Chicago. 



Issued August J6, 1912 



Vol, LIV CONTENTS FOR AUGUST J9J2 No. 2 



SPERMATOGENESIS IX EQUISETUM. Contributions from the Hill Botanical Labora- 

 tory 158 (with plates vii and viii). Lester W. Sharp ------- 



THE PRIMARY COLOR-FACTORS OF LYCHNIS AND COLOR- INHIBITORS OF PAPA- 



VER RHOEAS. George Harrison Skull - - 



CONTRIBUTIONS FROM THE ROCKY MOUNTAIN HEBARIUM. XI (with two fkires). 



Aven Nelson -------------- 



BENEFICIAL EFFECT OF CREATININE AND CREATINE ON GROWTH (with one 



figure). /. /. Skinner ------ -- 



BRIEFER ARTICLES 



89 



120 



136 



152 



A Note ox the Generations of Polysiph* r\ (with one figure). George B. Rigs and 



Annie D. Dalgity ------- - ..---- 164 



CURRENT LITERATURE 



BOOK REVIEWS 



lOREST PHi [OGRAPHY. A YOSEMITE FLORA 



NOTES FOR STUDENTS - - - - 



166 



.♦ 



168 



■- 



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