Epistemology

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.”

An Enquiry Concerning Human Understanding

Avenarius and the Standpoint of Pure Experience

On Sense and the Sensible

The Philosophy of Mystery

Ingersollia

Modern Skepticism: A Journey Through the Land of Doubt and Back Again

Creation or Evolution? A Philosophical Inquiry

The Jumble Book: A Jumble of Good Things

Manhood of Humanity

The Opinions of a Philosopher

The Meaning of Truth

The Observations of Professor Maturin

Sophist

The Philosophy and Theology of Averroes

Our Intellectual Strength and Weakness

Leibniz's New Essays Concerning the Human Understanding: A Critical Exposition

From Rome to Rationalismor: Why I Left the Church

Essays in Radical Empiricism

Some Turns of Thought in Modern Philosophy