Ube mniversit^ of Cbicago 



SULPHUR AS A FACTOR IN SOIL 

 FERTILITY 



A DISSERTATION 



SUBMITTED TO THE FACULTY 



OF THE OGDEN GRADUATE SCTHOOL OF SCIENCE 



IN CANDIDACY FOR THE DEGREE OF 



DOCTOR OF PHILOSOPHY 



DEPARTMENT OF BOTANY 



BY 



JOHN WOODARD 



Private Edition, Distributed By 



THE UNIVERSITY OF CHICAGO LIBRARIES 



CHICAGO, ILLINOIS 



Reprinted from 

 The Botanical Gazette, Vol. LXXIII, No. 2, February, 1922 



