will be welcome to a wider audience than the lecturer and the class for whom the volume was originally intended. We have been advised, of late, not to ignore our differences, but to study them. To do this, we must study not origins only, but developments. Origins are common ground. Developments mark the points of divergence. Such developments it has been also part of my object to trace; not so much for their own sake, as because they have become origins in their turn.
I have to thank the Dean of Canterbury for permission to print Nos. 35 and 97 from his edition of Luther's Primary Works, and No. 107 from his essay in Church and Faith (1890); Rev. T. B. Willson for the translation of No. 131; Miss Norah Leeson for that of No. 117; and my friend, Rev. F. E. Brightman, Fellow of Magdalen College, for reading my proofs. But I am under special obligations to the Delegates of the Press for procuring me the keen but kindly criticism of Mr. C. R. L. Fletcher, formerly Fellow of All Souls and Magdalen Colleges, and of Mr. P. S. Allen, Fellow of Merton College.