are mere empty shows, like the metaphysical theories that have gone to their long home in histories of philosophy. But to say this would be to accept complete scepticism, and a kind of scepticism which Mr. Balfour would, I am sure, disavow. He believes, of course, just as strongly as any one of us believes, in the astronomical theories of Newton and Laplace; or in the mathematical theories of the great physical sciences. That in which he disbelieves is a kind of bastard science called "naturalism," which, as he tells us, leads to contradictory or incoherent results. The naturalist, it appears, proposes to confine himself to the evidence of the senses, and ends by accepting a view of the world entirely inconsistent with the sensible perceptions. I see a green field: an object which has visual and other properties recognised by my organs of sense. No, says this misguided naturalist, you do not see what you suppose; what really happens is, that there is a vast whirlpool of atoms impinging upon each other and setting up vibrations, the last set of which is communicated to another set of atoms, called my optic nerve. These atoms, by their very nature imperceptible to the senses, are the only realities. We thus start from the senses and we get a world beyond the senses, a world which is a mere dance of infinite multitudes of bits of matter performing all manner of extraordinary gyrations and evolutions. The sensible impressions of colour, sound, and so forth, are mere illusions, somehow arising in a figment called the mind. This mind is a mere phantom--an unreal spectator of things and events, among which it has no place, and upon which it exercises no influence.