s 



<5'93 



f?^7 



JUN 8 192r 



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K' 



PARALLELISM OF THE SOILS DEVELOPED ON 

 THE GRAY DRIFTS OF MINNESOTA 



UC-NRLF 



B ^ SE3 b70 



A THESIS SUBMITTED TO THE FACULTY OF THE GRADUATE 

 SCHOOL OF THE UNIVERSITY OF MINNESOTA 



BY 



i 



CLAYTON ORD 'JIOST, B. Sc , M. A. 



iT-rx 



IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE 

 DEGREE OF DOCTOR OF PHILOSOPHY 



JUNE 1918 



