Volume LVIII 



Number 4 



THE 



Editor: JOHN M. COULTER 



OCTOBER 1914 



Delayed Germination in Seed of Alisma Plantago 



William Crocker and Wilmer E. Davis 



Spore Conditions in Hybrids and the Mutation Hypothesis of 



DeVries 



Edward C. Jeffrey 



Reproduction in Plants 



John M. Coulter 



New or Peculiar Zygomycetes. 3: Blakeslea, Dissophora, and 



Haplosporangium, Nova Genera 



Roland Thaxter 



The Forms of Antagonism Curves as Affected by Concentration 



W. J, V. Ostcrhout 



Current Literature 



The University of Chicago 



CHICAGO, ILLINOIS, TT.S.JL 



AgrentM 



THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 



KARL W. HIERSEMANN, Leipzig 

 THE MARUZEN-KABUSHiKJ-KAISHA, Tokyo, O»oka. Kyoto 





