PREFACE TO SECOND EDITION 



The first edition of -this work was published under 

 the title " The Chemistry of Soils and Fertilizers." In 

 the revision of the text the subject matter has been 

 entirely rewritten, new material has been added, and 

 the laboratory practice has been made a more promi- 

 nent feature. These additions have changed the scope 

 of the book to such an extent as to necessitate a change 

 of name. The work as now presented includes all of 

 the topics and laboratory practice relating to soils as 

 outlined by the Committee on methods of teaching 

 Agriculture, appointed by the Association of Agricul- 

 tural Colleges and Experiment Stations. The aim of 

 the book as presented in the preface ro the first edition 

 has been kept in view in the preparation of the second 

 edition. 



HARRY SNYDER. 

 UNIVERSITY OF MINNESOTA, 



COLLEGE OF AGRICULTURE, 

 ST. ANTHONY PARK, MINN. 



June i , 1905. 



