The treatment of any farmer's soil is entirely within his hands. Success is measured by his knowledge and the diligence with which he applies those laws of Nature which are related to crop growing.<br><br>These laws are universal. A farmer can apply them to meet his own particular need better than acting upon the advice anyone can give him, because he understands his soil conditions. Other people do not.<br><br>The purpose of this book is to set forth these laws and explain the causes and effects.<br><br>The Oliver Chilled Plow Works has a desire to be of practical value to farmers. Our long experience in building plows and kindred implements for use all over the world has given us an opportunity to observe a great many facts in connection with plows and plowing which should be common knowledge among farmers.