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of Proteus (15 D) in the Euthydemus (288 B) and Io (541 E). The kingly science has already appeared in the Euthydemus, and will reappear in the Republic and Statesman. But neither from these nor any other indications of similarity or difference, and still less from arguments respecting the suitableness of this little work to aid Socrates at the time of his trial or the reverse, can any evidence of the date be obtained.