The Principles of Soil Management 



Completely revised and rewritten by 



THOMAS LYTTLETON LYON 



Professor of Soil Technology in the New York State College of Agriculture 



ELMER O. PIPPIN 



Extension Professor of Soil Technology in the New York State College of 

 Agriculture 



HARRY OLIVER BUCKMAN 



Assistant Professor of Soil Technology in the New York State College of 

 Agriculture 



8 10 pp., i2mo, $1.90 

 Rural Text-Book Series 



In the last five years much has been added to our knowl- 

 edge of soils. In no equal period of time have there been 

 so many contributions to the subject by investigators in all 

 of the countries of Europe as well as our own. As the soil 

 is a very complex material, it has been studied by agrono- 

 mists, chemists, physicists, botanists, bacteriologists and 

 zoologists, and the literature is scattered throughout the 

 journals of all of these sciences. In the work, thus made 

 necessary, of bringing this book completely abreast of the 

 present knowledge, the cooperation of Dr. H. O. Buckman 

 has been secured. In a general way the arrangement of 

 the book is the same as before, but the matter itself is 

 almost entirely changed. In every chapter change and 

 advance have been possible, but particularly in those relat- 

 ing to the colloidal material of the soil, the organic matter, 

 the geo-chemical relations, acidity of soils, absorption, cata- 

 lytic fertilizers, and soil surveys. The make-up of the book 

 has been altered by dividing it into chapters instead of 

 using the system of main heads and sub-heads used before. 

 A very complete set of references to all literature cited 

 enables the reader to go back to the original sources when- 

 ever he wishes. On account of the new material added, the 

 book is somewhat larger than the previous editions. 



THE MACMILLAN COMPANY 



Publishers 64-66 Fifth Avenue New York 



