Three decades have elapsed since Whitehead’s attempt to set philosophy to this “sustained effort”, and the philosophic scene is more crowded than ever with empiricist, existentialist, and positivist partisans of the “detached question”. Where philosophy has not become anti-philosophical it has become ancillary to science. “Constructive thought”, for many today, has no other meaning than the activity of the theoreticians of the exact sciences. Should we then accept as fact that Whitehead was wrong? To answer either way is to state the nature of the philosophic enterprise.