Metaphysics

The Philosophy of Evolution

Fundamental Philosophy

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

Time and Free Will

Hints towards the formation of a more comprehensive theory of life

The Signature of All Things

The Meaning of the War: Life & Matter in Conflict

Phaedo

The Metaphysical Elements of Ethics

A Candid Examination of Theism

The Philosophy of the Conditioned

The Philosophy of Natural Theology

Thoughts on Life and Religion

What Is Reality

Creation or Evolution? A Philosophical Inquiry

You Can't Buy Eternity