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I should like to thank Dr. Robert Kehl, Zurich, most sincerely for many suggestions and for his special help when he acted as guest author for one section. Dr. Kehl first studied theology, but later switched to law and political science. His legal commentaries are in daily use by Swiss lawyers and he has made a name for himself with important works on moral theology, among many others. At the same time I should like to express my thanks to the thirty-two publishers who are going to arrange for the worldwide publication of this book.