The Organic Matter of the Soil: A Study of 



the Nitrogen Distribution in Different 



Soil Types 



A THESIS SUBMITTED TO THE FACULTY OF THE GRADUATE 

 SCHOOL OF THE UNIVERSITY OF MINNESOTA 



BY 



CLARENCE AUSTIN MORROW, B.S., M.A. 



< i 



IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE 

 DEGREE OF DOCTOR OF PHILOSOPHY 



JUNE, 1918 



MINNEAPOLIS 

 UNIVERSITY PRINTING CO. 



