- Christianity as Mystical Fact, and the Mysteries of Antiquity
- New Ideas in India During the Nineteenth Century: A Study of Social, Political, and Religious Developments
- Oriental Religions and Christianity: A Course of Lectures Delivered on the Ely Foundation Before the: Students of Union Theological Seminary, New York, 1891
- Pagan and Christian Creeds: Their Origin and Meaning
- Ten Great Religions: An Essay in Comparative Theology