THE 



KANSAS UNIVERSITY 

 SCIENCE BULLETIN. 



Vol. IX, No. 7— December, 1914. 



(Whole Series, Vol. XIX, No. 7.) 



CONTENTS: 



A Contribution to the Subject of the Factors Concerned 



in Soil Productivity by Conrad Hoffmann. 



PUBLISHED BY THE UNIVERSITY, 

 LAWRENCE, KAN. 



Entered at the post-office in Lawrence as second-class matter. 



5-2+96 



