Epistemology

Flowers of Freethought (Second Series)

Phaedrus

The Advancement of Learning

M. Cousin's Course of Philosophy

Know the Truth: A Critique on the Hamiltonian Theory of Limitation

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 Inquiry into the Human Mind: On the Principles of Common Sense

An Enquiry Concerning Human Understanding

Avenarius and the Standpoint of Pure Experience

On Sense and the Sensible

The Philosophy of Mystery

Life and Conduct

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

Modern Rationalism

Manhood of Humanity

The Opinions of a Philosopher

The Meaning of Truth