Collections of sources in the original languages, easily procured and to be consulted for texts and to some extent for bibliographies: C. Mirbt, _Quellen zur Geschichte des Papsttums und des römischen Katholizismus_, third edition, Tübingen, 1911. Cited as Mirbt. C. Kirch, S. J., _Enchiridion fontium historiæ ecclesiasticæ antiquæ_. Freiburg-i.-B., 1910. Cited as Kirch. H. Denziger, _Enchiridion symbolorum, definitionum et declarationum de rebus fidei et morum_, eleventh edition, edited by Clemens Bannwart, S. J., Freiburg-i.-B., 1911. Cited as Denziger. A. Hahn. _Bibliothek der Symbole und Glaubensregeln der alten Kirche_, third edition, Breslau, 1897. Cited as Hahn. G. Krüger. _Sammlung ausgewählter kirchen und dogmengeschichtlicher Quellenschriften_, Freiburg-i.-B. Of this useful collection especially important are the following of more general application: E. Preuschen, _Analecta: Kürzere Texte zur Geschichte der alten Kirche und des Kanons_, second edition, 1909-10. F. Lauchert, _Die Kanones der wichtigsten altkirchlichen Concilien nebst den apostolischen Kanones_. R. Knopf, _Ausgewählte Märtyreracten_. Cited as Knopf. Other volumes are cited in connection with topics. H. T. Bruns, _Canones apostolorum et conciliorum sæculorum IV, V, VI, VII_, Berlin, 1839. Cited as Bruns. Although not source-books, yet of very great value for the sources they contain should be mentioned: J. C. L. Gieseler, _A Text-Book of Church History_, English translation, New York, 1857. K. R. Hagenbach, _A History of Christian Doctrines_, English translation, Edinburgh, 1883-85. C. J. Hefele, _Conciliengeschichte_, Freiburg-i.-B., 1855-70. Second edition, 1873 _et seq._ A new French translation with admirable supplementary notes has just appeared. The English translation (_History of the Councils_), Edinburgh, 1876-95, extends only through the eighth century. Cited as Hefele. THE FIRST DIVISION OF ANCIENT CHRISTIANITY: THE CHURCH UNDER THE HEATHEN EMPIRE: TO A. D. 324