Metaphysics

A Candid Examination of Theism

The Philosophy of the Conditioned

The Philosophy of Natural Theology

Thoughts on Life and Religion

Creation or Evolution? A Philosophical Inquiry

Frameshifting

The Distinction between Mind and Its Objects

Philosophy in the Last Forty Years

Evolution of Life and Form

The Philosophy of Evolution

An Enquiry Concerning Human Understanding

The Meaning of Evolution

Reincarnation: A Study in Human Evolution

History of Modern Philosophy

Lectures on the Proofs of the Existence of God

The Three Critiques

Absurdities of Immaterialism Or, A Reply to T. W. P. Taylder's Pamphlet, Entitled, “The Materialism of the Mormons or Latter-Day Saints, Examined and Exposed.”

Ethics

Gospel Philosophy

Eureka: A Prose Poem