Metaphysics

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.”

The Philosophy of Evolution

Monism as Connecting Religion and Science

Man or Matter

Phaedo

Time and Free Will

Life and Matter: A Criticism of Professor Haeckel's “Riddle of the Universe”

History of Modern Philosophy

Hints towards the formation of a more comprehensive theory of life

The Philosophy of Natural Theology

An Enquiry Concerning Human Understanding

The Philosophy of the Conditioned

You Can't Buy Eternity

Creation or Evolution? A Philosophical Inquiry

A Hundred Poes

Freedom, Truth and Beauty

Life: Its True Genesis

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

Blue Guardians of Sadalsuud

Lectures on the Proofs of the Existence of God