In giving these pages to the public I offer no apology for a restatement of fundamental principles always requiring adjustment to new life and circumstances; but economic literature has usually dealt too exclusively with the phenomena of manufactures and commerce to gain the sympathy of rural people. An experience of more than thirty years in handling such subjects at the Michigan and Kansas Agricultural Colleges, together with the expressed confidence of former pupils whose judgment I trust, has led me into the effort to bring the subject home to farmers and farmers' families in this elementary way