Metaphysics

The Philosophy of Evolution

Ethics

A Candid Examination of Theism

Proslogion

Time and Free Will

Chance, Love, and Logic

Life's Basis and Life's Ideal: The Fundamentals of a New Philosophy of Life

Death

The Meaning of Evolution

Life: Its True Genesis

The Metaphysical Elements of Ethics

Gospel Philosophy

The Improvement of Human Reason

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.”

Eureka: A Prose Poem

Philosophies

An Enquiry Concerning Human Understanding

Mind and Motion and Monism

Early Greek philosophy

Early Twentieth-Century Continental Philosophy