Lectures at the Valparaiso University School of Law on March 26th and 27th, 1985. Edward A. Seegers has been a generous benefactor of the School, and it is an honor to be invited to present lectures in honor of such a friend of learning; all the more so'in that the 1985 lectures in the series followed those of Professors Harold Berman and Tom Shaffer, and are to precede lectures by Ppofessor Eugene V. Rostow, of whom I once had the good fortune to be a junior colleague when he was Eastman Professor at Balliol College, Oxford, and who is hirnself author of a seminal article l in the fjeld laddress here. The text of the lectures as printed here is as faithful a reproduction of the lectures in their original spoken form as is consistent with proper respect for the requirements of literary presentation.