A major problem which occupied thinkers in the later Middle Ages was the question of the internal structure of the Church and the proper interrelationship of its members. This book is an account of those canonistic theories of Church government which contributed to the growth of the conciliar theory, and which were formulated between Gratian's Decretum (c. 1140) and the Great Schism (1378). It is concerned particularly with the juristic development of the fundamental conciliar doctrine, the assertion that the universal Church was superior to the Church of Rome, with a consequent denial...

First published in 1988, this volume surveys the chemical synthesis and biological activity of the benz a]anthracenes. These compounds occur in smoke and mineral oils and a few have been shown to be potent carcinogens. This volume was the first to review, systematically and in depth, the organic synthesis of these compounds as well as their metablolism, interactions with nucleic acids and protein, mutagenicity and carcinogenicity. Such studies have important implications in determining mechanism and specificity of chemically induced carcinogenesis.

This book was first published in 1980. Walter Ullmann made substantial contributions to many areas of medieval studies, and to those of papal history and cannon law particularly, which have been distinguished by quality and quantity alike. The bibliography of his published work included in this volume contains almost four hundred items. No less influential for generations of students have been his teaching and lecturing, especially at Leeds and from 1949 to 1978 at Cambridge. In Authority and Power friends and former pupils combined to mark his retirement from the Cambridge Chair of Medieval...