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In the Sophist, where he is refuting the scepticism which

maintained either that there was no such thing as predication, or

that all might be predicated of all, he arrives at the conclusion

that some ideas combine with some, but not all with all. But he

makes only one or two steps forward on this path; he nowhere

attains to any connected system of ideas, or even to a knowledge

of the most elementary relations of the sciences to one another.