In this book, Sally Falk Moore examines a hundred years in the history of an African people, the Chagga of Kilimanjaro, in order to understand how their present system of 'customary' laws came to be the way it is, and how the idea of custom was used in Tanzania's experiment with African socialism. She discusses the changes that have occurred in the formal legal system, alongside the vast economic and political transformations that came with cash cropping and colonial rule. She also presents a 'legal' chronicle of the members of one lineage to illustrate its use of the formal legal system. This study of the difference between law in the life of a people and law in the local courts will interest teachers and students of legal anthropology and law and also provides an important contribution to anthropological theory. In addition it has practical relevance for the understanding of the operation of 'traditional' institutions and will appeal to readers interested in African history and African studies.