Under such metaphysical or extra-empirical presuppositions all investigation, whether it be crudely empirical or (in the physical sense) scientific, is carried on. And when so carried on, it is said to be prosecuted apart from any interference from metaphysic. Such a naïve or natural metaphysic, not raised to explicit consciousness, not followed as an imposed rule, but governing with the strength of an immanent faith, does not count for those who live under it as a metaphysic at all. M. Jourdain was amazed suddenly to learn he had been speaking prose for forty years without knowing it. But in the present case there is something worse than amazement sure to be excited by the news. For the critic who thus reveals the secrets of the scientist’s heart is pretty sure to go on to say that a good deal of this naïve unconscious metaphysic is incoherent, contradictory, even bad: that it requires correction, revision, and readjustment, and has by criticism to be made one and harmonious. That readjustment or criticism which shall eliminate contradiction and produce unity, is the aim of the _science_ of metaphysic—the science of the meta-physical element in physical knowledge: what Hegel has chosen to call the Science of Logic (in the wide sense of the term). This higher Logic, this _science_ of metaphysic, is the process to revise and harmonise in systematic completeness the imperfect or misleading and partial estimates of reality which are to be found in popular and scientific thought.