theories of law: natural law and legal positivism.' Both theories level charges against the other. Some are perceptive; others are unfounded. What is less well known, but equally true, is that historically both the natural law defenders and the proponents of legal positivism have disagreed as much among themselves as with their opponents. If progress is to be made in legal philosophy by studying the works of important legal philosophers, it will be made by carefully examining the theories developed, rather than by attaching a label to the philosopher and then assuming certain things about that legal philosopher because the label has been attached. This is particularly true of the works of H.L.A. Hart.