Excerpt from the Author's Preface: "The "sociologic concept of the State," as Ludwig Gumplowicz termed it, is assured of ultimate general acceptance. Its opponents are strenuous and persevering, and I once called them "the sociologic root of all evil;" but the concept, none the less, is the basic principle of "bourgeoisie" sociology, and will be found of value in the study, not only of economics and history, but in that of Law and Constitutional History."