Ube "Clniversitp of Cbicago 



SULPHUR AS A FACTOR IN SOIL 

 FERTILITY 



A DISSERTATION 



SUBMITTED TO THE FACULTY 



OF THE OGDEN GRADUATE SCHOOL OF SCIENCE 



IN CANDIDACY FOR THE DEGREE OF 



DOCTOR OF PHILOSOPHY 



DEPARTMENT OF BOTANY 



OP" 19- 



BY 



JOHN WOODARD 



j*^ 



Private Edition, Distributed By 



THE UNIVERSITY OF CHICAGO LIBRARIES 



CHICAGO, ILLINOIS 



Reprinted from 

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



