THE ULTIMATE PHYSICAL CONCEPTS The second chapter of this book lays down the first principle to be guarded in framing our physical concept.

We must avoid vicious bifurcation.

Nature is nothing else than the deliverance of sense-awareness.

We have no principles whatever to tell us what could stimulate mind towards sense-awareness.

Our sole task is to exhibit in one system the characters and inter-relations of all that is observed.
Our attitude towards nature is purely 'behaviouristic,' so far as concerns the formulation of physical concepts.
Our knowledge of nature is an experience of activity (or passage).