Harnack, A. Das Wesen des Christentums, 1900, 2d ed.,
1908; What is Christianity? 1901, 2d ed., 1910.
Sprüche und Reden Jesu, 1907; The Sayings of
Jesus, 1908.
Aus Wissenschaft und Leben, 2 vols., 1911.
Loisy, A. L'Évangile et l'Église, 3d ed., 1904; The
Church and the Gospel, 1903.
Bousset, W. Was wissen wir von Jesus? 1904.
Kyrios Christos; Geschichte des Christusglaubens von
den Anfängen des Christentums his Irenæus, 1913.
Schumacher, H. Die Selbstoffenbarung Jesu bei Mat 11, 27
(Luc 10, 22), 1912 (Freiburger Theologische Studien,
Heft 6).
Schweitzer, A. Von Reimarus zu Wrede, 1906; The
Quest of the Historical Jesus, 1910.
Drews, A. Die Christusmythe, 4th ed., 1911; The Christ-Myth,
3d ed., 1910.
Warfield, B. B. The Lord of Glory, 1907; and recent
articles in theological reviews.
Thorburn, T. J. Jesus the Christ: Historical or Mythical?
1912.
For Chapter II
Darwin and Modern Science. Edited by A. C. Seward,
1909. Anniversary Volume by Various Authors.
Fifty Years of Darwinism, 1909. Anniversary Volume by
Various Authors.
Weismann, A. The Evolution Theory, 2 vols., 1904.
Wallace, A. R. The World of Life, 1911.
Man's Place in the Universe, 3d ed., 1905.
Morgan, T. H. Evolution and Adaptation, 1908.
Henderson, L. J. The Fitness of the Environment, 1913.
Thomson, J. A. The Bible of Nature, 1908.
Merx, J. T. History of European Thought in the Nineteenth Century. Vol. II, 1903.
Herbert, S. First Principles of Evolution, 1913.
For Chapter III
James, W. Varieties of Religious Experience, 1903.
The Will to Believe, and Other Essays in Popular
Philosophy, 1902.
Starbuck, E. D. The Psychology of Religion, 1900.
Ames, E. C. The Psychology of Religious Experience,
1910.
Leuba, J. H. A Psychological Study of Religion, 1912.
Pratt, J. B. The Psychology of Religious Belief, 1907.
Stevens, George. The Psychology of the Christian Soul, 1911.
Royce, J. The Sources of Religious Insight, 1912.
Begbie, H. Twice-Born Men, 1909.
Jastrow, Joseph. The Subconscious, 1906.
Coe, George A. The Religion of a Mature Mind, 1902.