postolic Age_ (1900); Carl Weizsaecker, _The Apostolic Age_ (Eng.
trans., 1897); Otto Pfleiderer, _Das Urchristentum_ (1902).

_The Expansion of Christianity._--Edwin Hatch, "The Influence of Greek
Ideas and Usages upon the Christian Church," the _Hibbert Lectures,
1888_ (1890); Adolf Harnack, _The Expansion of Christianity in the
First Three Centuries_ (Eng. trans., 1904); Sir W.M. Ramsay, _The
Church in the Roman Empire_ (1893).

_The History of Church and of Dogma._--Adolf Harnack, _History of
Dogma_ (Eng. trans., 1895); Reinhold Seeberg, _Lehrbuch der
Dogmengeschichte_ (1895, 2 vols.); Philip Schaff, _The Creeds of
Christendom_ (3 vols., 1881, 3rd ed.).

_The Roman Church._--Joseph Wilhelm and Thomas B. Scannell, _Manual of
Catholic Theology_ (1906); J.A. Moehler, _Symbolism_ (trans. 1844);
Thomas Aquinas, _The Summa_ (Eng. trans., 1907); William Ward, _The
Ideal of a Christian Church_ (1844).

_The Greek Church._--"The Creeds of the Greek and Russian Churches,"
in Schaff, _Creeds_, vol. ii. pp. 275-542; and J. Michalcesu, _Die
Bekenntnisse und die wichtigsten Glaubenszeugnisse der
griechisch-orientalischen Kirche_ (Leipzig, 1904).

_Protestantism._--John Calvin, _Institutio Religionis Christianae_,
(1536; Eng. trans., 1816); Charles Hodge, _Systematic Theology_ (3
vols., 1872); Ernst Troeltsch, _Die Absolutheit des Christentums und
die Religionsgeschichte_ (1902); _First Principles of the Reformation,
or the Ninety-five Theses and the Three Primary Works_, trans. by
Henry Wace and C.A. Buchheinz (1883).

_Christianity in the Modern World._--Andrew D. White, _Conflict of
Science with Theology_ (2 vols., 1896); D.F. Strauss, _Der alte und
der neue Glaube_ (1872; Eng. trans., 1873); A.J. Balfour, _The
Foundations of Belief_ (1897); J. Ward, _Naturalism and Agnosticism_
(1899).

_Modern Adaptations of Christianity._--William Adams Brown, _Christian
Theology in Outline_ (1906); Augustus Sabatier, _Religions of
Authority and the Religion of the Spirit_ (1904); J.A. Zahm,
_Evolution and Dogma_ (1896); John Henry Newman, _An Essay on the
Development of Christian Doctrine_ (1845); Edward Caird, _The
Evolution of Religion_ (1893); Otto Pfleiderer, _Philosophy of
Religion_ (Eng. trans., 1888, especially volumes 3 and 4); Newman
Smyth, _Old Faiths in New Lights_ (1879), _Through Science to Faith_
(1902); Henry Drummond, _The Ascent of Man_ (189