Qhe Botanical (Sasette 



B flfcontblE Journal Embracing all Departments of JBotanfcal Science 



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



University of Chicago. 



Issued October 15, J9J4 



Vol LVTII CONTENTS FOR OCTOBER J9J4 No. 4 



DELAYED GERMIXATIOX IX SEED OF ALISMA PLAXTAGO. Contributions from 



the Hull Botanical Laboratory 194 (with eight figures). William Crocker and 



W timer E. Davis 



285 



SPORE COXDITIOXS IX HYBRIDS AND THE MUTATION HYPOTHESIS OF DE 



VRIES (with plates xxii-xxv). E ird C. Jejjrey 



REPRODUCTION IX PLANTS. Contributions from the Hull Botanical Laboratory 195. 



322 



John J/. Coulter 



337 



XEW OR PECULIAR ZYGOMYCETES. 3: BLAKESLEA, DISSOPHORA, AND HAPLO 



SPORANGIUM, NOVA GENERA (with pates xxvi-xxix). Roland Thaxter - - 353 



/ 



THE FORMS OF ANTAGONISM CURVES AS AFFECTED BY CONCENTRATION (with 



three figures). \Y . J. V. Osterhoiit ---------- 



CURRENT LITERATURE 



NOTES FOR STUDENTS - - - - - - --- 



3^1 



37 2 



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