This book contains a detailed treatise on soil tillage, with particular focus on moldboard type tools and machinery used for soil tillage. This text concentrates on the more scientific side of soil tillage, and contains a wealth of formulae, graphs, and data tables that will be of much value to the farmer or student with an interest this side of the topic. Written in clear, concise language and profusely illustrated, this text constitutes an invaluable tool for those interested, and makes for a worthy addition to collections of agricultural literature. The chapters of this book include: 'Functions of Tillage', 'Mechanics of Tillage', 'Plasticity Constants', 'Soil and Metal Friction', 'Sheer Values of Uncemented Soils', 'Moldboard Plows', 'Types of Moldboard Plows', 'The Plow Bottom', 'Materials for Moldboards and Shares', 'Types of Moldboards', 'Expression of Moldboard Shapes', etcetera. We are proud to republish this vintage text, now complete with a new introduction on agricultural tools and machinery.