Symbolic Logic

The Expression of the Emotions in Man and Animals

Voltaire's Philosophical Dictionary

The Will to Believe : and Other Essays in Popular Philosophy

A Discourse of a Method for the Well Guiding of Reason / and the Discovery of Truth in the Sciences

Mysticism and Logic and Other Essays

Introduction to the Philosophy and Writings of Plato

The Game of Logic

A Letter to a Hindu

On the Origin of Species By Means of Natural Selection, or, the Preservation of Favoured Races in the Struggle for Life

The Symbolism of Freemasonry / Illustrating and Explaining Its Science and Philosophy, Its Legends, Myths and Symbols