Many of the pertinent articles in Hastings’ _Dictionary of the Bible
and Encyclopaedia of Religion and Ethics_, in the _Encyclopaedia
Britannica_, 11 ed., and in similar works are written by specialists
and are valuable.
A. Harnack: _Lehrbuch der Dogmengeschichte_, I, 4 ed., 1909; English
translation from the third German edition, I and II, 1901. The most
valuable book on the subject. F. Loofs: _Leitfaden zum Studium der
Dogmengeschichte_, 4 ed., Halle, 1906. The opening chapters cover the
early period. G. B. Stevens: _The Theology of the New Testament_, 1903.
H. Holtzmann: _Lehrbuch der neutestamentlichen Theologie_, 2 vols., 2
ed., 1911.
A. C. McGiffert: _History of Christianity in the Apostolic Age_, 1897.
J. H. Ropes: _The Apostolic Age_, 1906.
S. J. Case: _The Evolution of Early Christianity_, 1914. K. Lake: _The
Earlier Epistles of St. Paul_, 1911; _The Stewardship of Faith_, 1915.
T. R. Glover: _The Conflict of Religions in the Roman Empire_, 1909.
J. Geffcken: _Zwei griechischen Apologeten_, 1907. An important
commentary to Aristides and Athenagoras, preceded by an introduction
dealing with the history and characteristics of the Greek Apologists,
and followed by a sketch of the development of the apologetic
literature after Athenagoras to Augustine. A. Puech: _Les apologistes
grecs du II^e siècle de notre ère_, 1912.
H. S. Mansel: _The Gnostic Heresies_, 1875. E. de Faye: _Gnostiques et
gnosticisme_, 1913.
C. Bigg: _The Christian Platonists of Alexandria_, 1886. E. de Faye:
_Clément d’Alexandrie_, 2 ed., 1906.
P. Wendland: _Die hellenistisch-römische Kultur in ihren Beziehungen
zu Judentum und Christentum_, 2 ed., 1912. A book of prime importance
on the conditions of the ancient world during the beginnings of
Christianity. E. Hatch: _The Influence of Greek Ideas and Usages
upon the Christian Church_, 8 ed., 1901. G. Anrich, _Das antike
Mysterienwesen in seinem Einfluss auf das Christentum_, 1894. G.
Wobbermin: _Religionsgeschichtliche Studien zur Frage der Beeinflussung
des Urchristentums durch das antike Mysterienwesen_, 1896. C. Clemen:
_Religionsgeschichtliche Erklärung des Neuen Testaments_, 1909; English
translation: _Primitive Christianity and its Non-Jewish Sources_, 1912;
_Der Einfluss der Mysterienreligionen auf das älteste Christentum_,
1913. C. H. Moore: _Greek and Roman Ascetic Tendencies in Harvard
Essays on Classical Subjects_, pp. 97-140, 1912. H. Streithman:
_Geschichte der frühchristlichen Askese in der Umgebung des werdenden
Christentums_, 1914. This book I have been unable to see. A. Deissman:
_Licht vom Osten_, 3 ed., 1909; English translation, _Light from the
Ancient East_, chap. iv, 1910. R. Reitzenstein: _Die hellenistischen
Mysterienreligionen_, 1910. E. Maass: _Orpheus. Untersuchungen zur
grieschischen, römischen, altchristlichen Jenseitsdichtung und
Religion_, 1895. A. Dieterich: _Nekyia_, 2 ed., 1913.
A. Harnack: _Mission und Ausbreitung des Christentums in den ersten
drei Jahrhunderten_, 2 vols., 3 ed., 1915; English translation: _The
Expansion of Christianity in the First Three Centuries_, 2 ed., 2
vols., 1908.