SOILS AND SOIL FERTILITY 



By A. R. WHITSON, Professor of Soils and Drainage, College of 



Agriculture, University of Wisconsin, and H. L. WALSTER, 



Instuctor of Soils, University of Wisconsin. 



300 Pages, well illustrated, cloth, $1.60 net. 



Soils and Soil Fertility is a book especially prepared as a text 

 book on the subject of Soils for high school courses in agriculture 

 and short courses in colleges. There are chapters on the follow- 

 ing subjects: Conditions Essential to Plant Growth, Origin and 

 Classification of Soils; Primary Relations of Soil and Plant; Nitrogen; 

 Phosphorus and Potash; Soil Analyses; Farm Manures; Commercial 

 Fertilizers; Physical Properties of Soils; Water Supply; Temperature 

 and Ventilation of Soils; Drainage; Erosion; Tillage; Humus; Relation 

 of Crops to Climate and Soils :Soils of the United States; Management 

 of Important Types of Soil; Dry Farming. The explicit language of 

 this book and the avoidance of complicating scientific data and techni- 

 cal terms make it well within the comprehension of young students. 

 They will find in it a fascinating study of soils and the practical ways of 

 handling land to produce good crops. A well-chosen set of laboratory 

 exercises and demonstrations, with complete directions, is also included. 

 These are simple, easily carried out, and are fundamental. Well 

 illustrated, printed on high-grade paper, bound durably in cloth. 



AGRICULTURAL ENGINEERING 



(In Preparation.) 



By J. B. DAVIDSON, Professor of Agricultural Engineering, Iowa 

 State College. 



550 pages, profusely illustrated, cloth, $1.80 net. 



The growing scarcity of farm labor is causing the farmer to invest 

 most heavily in machinery and mechanical devices. This book aims 

 to present in simple terms the engineering facts and principles that will 

 insure successful practice and financial gain in farm management. 

 Among the subjects discussed are: Agricultural Surveying, Drainage, 

 Irrigation, Road Construction; Farm Machinery, including Elements 

 of Machines, Materials and Lubrication, etc.; Wagons, Buggies, Pumps; 

 Farm Motors; Steam and Gas Tractors; Farm Structures; and Farm 

 Sanitation. The information is essentially practical and easily acquired. 

 The book will train both the head and the hand. 



POPULAR FRUIT GROWING 



By SAMUEL B. GREEN, late Professor of Horticulture and Forestry, 

 University of Minnesota. 



300 Pages, 120 illustrations, cloth. $1.50 postpaid. 



This book covers the factors of successful Fruit Growing, with 

 lists of fruits adapted to each state; Orchard Protection, Injurious 

 Insects and Diseases, Spraying, Harvesting and Marketing Methods, 

 Propagation of Fruits, etc. A very popular book for schools and col- 

 leges. A new, revised edition by Le Roy Cady, Professor of Horti- 

 culture, University of Minnesota, is just out. 



