Metaphysics

Blue Guardians of Sadalsuud

Lectures on the Proofs of the Existence of God

The Distinction between Mind and Its Objects

Facts of Consciousness

Philosophy in the Last Forty Years

Reincarnation: A Study in Human Evolution

The Meaning of Evolution

The Metaphysical Elements of Ethics

The Three Critiques

The Philosophy of Evolution

Evolution of Life and Form

A Candid Examination of Theism

Thoughts on Life and Religion

Gospel Philosophy

Mind and Motion and Monism

Eureka: A Prose Poem

Ethics

Time and Free Will

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

History of Modern Philosophy