When this work was begun, the design was that it should form a part of the exhibit of Unitarianism in this country presented at the seventy-fifth anniversary of the formation of the American Unitarian Association. The time required for a careful verification of facts made it impossible to have the book ready at that date. The delay in its publication has not freed the work from all errors and defects, but it has given the opportunity for a more adequate treatment of many phases of the subject. Much of the work required in its preparation does not show itself in the following pages; but it has involved an extended examination of manuscript journals and records, as well as printed reports of societies, newspapers, magazines, pamphlets, and books. Many of the subjects dealt with, not having been touched upon in any previous historical work, have demanded a first-hand study of records, often difficult to find access to, and even more difficult to summarize in an interesting and adequate manner. I wish here to warmly thank all those persons, many in number and too numerous to give all their names, who have generously aided me with their letters and manuscripts, and by the loan of books, magazines, pamphlets, and newspapers. Without their aid the book would have been much less adequate in its treatment of many subjects than it is at present. Though I am responsible for the book as it presents itself to the reader, much of its value is due to those who have thus labored with me in its preparation. In manuscript and in proof-sheet it has been read by several persons, who have kindly aided in securing accuracy to names, dates, and historic facts. G.W.C. BOSTON, October 1, 1902. CONTENTS I. INTRODUCTION.--ENGLISH SOURCES OF AMERICAN UNITARIANISM Renaissance Reformation Toleration Arminianism English Rationalists II. THE LIBERAL SIDE OF PURITANISM The Church of Authority and the Church of Freedom Seventeenth-century Liberals Growth of Liberty in Church Methods A Puritan Rationalist Harvard College III. THE GROWTH OF DEMOCRACY IN THE CHURCHES Arminianism The Growth of Arminianism Robert Breck Books Read by Liberal Men The Great Awakening Cardinal Beliefs of the Liberals Publications defining the Liberal Beliefs Phases of Religious Progress IV. THE SILENT ADVANCE OF LIBERALISM Subordinate Nature of Christ Some of the Liberal Leaders The First Unitarian A Pronounced Universalist Other Men of Mark The Second Period of Revivals King's Chapel becomes Unitarian Other Unitarian Movements Growth of Toleration