"Tt- 



A STUDENT'S BOOK 



ON 



SOILS AND MANURES 



-rA'^ -r-' 



BY 



E: J. RUSSELL, D.Sc, F.R.S. 



DIRECTOR OF THE ROTHAMSTED EXPERIMENTAL STATION 

 HARPENDEN 



SECOND EDITION 

 Revised and Enlarged 



CAMBRIDGE 



AT THE UNIVERSITY PRESS 



1921 



