BASIC SLAGS 



BY 



GEORGE SCOTT ROBERTSON, 



D.Sc. (DuNEo, F.I.C. 



HEAD OF THE CHEMICAL RESEARCH DIVISION MINISTRY OF AGRICULTURE 



AND CHIEF AGRICULTURAL ANALYST FOR NORTHERN IRELAND, 



FORMERLY HEAD OF THE CHEMISTRY DEPARTMENT, 



INSTITUTE OF AGRICULTURE, CHELMSFORD 



WITH A PREFACE BY 

 EDWARD J. RUSSELL, 



D.Sc. (LOND.), F.E.S. 



DIRECTOR OF THE ROTHAMSTED 

 EXPERIMENTAL STATION 



CAMBRIDGE 

 AT THE UNIVERSITY PRESS 



1922 



