THE SOIL, 



AN INTRODUCTION TO THE SCIENTIFIC 

 STUDY OF THE GROWTH OF CROPS 



BY A. D. HALL, M.A. (Oxon.) 



DIRECTOR OF THE ROTHAMSTED STATION 

 (LAWES AGRICULTURAL TRUST) 



FOREIGN MEMBER OF THE ROYAL ACADEMY OF AGRICULTURE 



OF SWEDEN 



SECOND EDITION, REVISED AND ENLARGED 



LONDON 

 JOHN MURRAY, ALBEMARLE STREET, W. 



1912 



