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own convictions to the proof, not because he doubts them, but because he believes in them. For, both as to that which he holds for true and as to that which he holds for false, he believes that one final test applies. Let error have free play, and one of two things will happen. Either as it develops, as its implications and consequences become clear, some elements of truth will appear within it. They will separate themselves out; they will go to enrich the stock of human ideas; they will add something to the truth which he himself mistakenly took as final; they will serve to explain the root of the error; for error itself is generally a truth misconceived, and it is only when it is explained that it is finally and satisfactorily confuted. Or, in the alternative, no element of truth will appear. In that case the more fully the error is understood, the more patiently it is followed up in all the windings of its implications and consequences, the more thoroughly will it refute itself. The cancerous growth cannot be extirpated by the knife. The root is always left, and it is only the evolution of the self-protecting anti-toxin that works the final cure. Exactly parallel is the logic of truth. The more the truth is de-