The theme of this volume is the transformation of European Christianity into a world-wide religion. The spirit of crusade against Islam was one impulse driving the early expansion; these essays show how new ideologies of mission were developed and how perceptions have continued to evolve, notably in the light of Vatican II. They reveal the differing attitudes and roles of missionaries in such radically different environments as America and China, and the equally varied ways in which this activity was received, with the many problems of accomodation and sycretism. Topics covered include the development of new institutions to control missionary activity, notably the Roman Propaganda Fidei, tensions around race and the role of women, and the stimulus given, for instance to linguistic studies, by the need to communicate. Finally, they examine the belated awakening of the Protestant churches to the need to compete with Rome in the evangelization of the world.