Never before in the history of mankind has there been a period when hitherto accepted moral principles have been more severely tested. The agonized cry of a world smitten by two major wars in a handful of years leaves no doubt in the minds of many that natural law ethics, ifit is to have relevance and to survive, must provide at least the outline of an answer to the problems of every day living. To date, many hundreds of books and articles have been written setting forth with great eloquence the basic and immutable principles of natural law ethics. But too often these discussions fail to consider, in their agonizing detail, situations where there is a choice between conflicting values, conflicting loyalties, conflicting ideas and duties, each of which has a claim to recognition. It is only in the isolation of the particular case that the frightening dilemmas of natural law can be most clearly experienced. To give just two illustrations.