I agree, however, with Teichmüller that the doctrines of reminiscence and metempsychosis have a purely mythical significance, and I should have expressed my views on the subject with more definiteness and decision had I known that his authority might be quoted in their support. I think that Plato was in a transition state from the Oriental to what afterwards became the Christian theory of retribution. In the one he found an allegorical illustration of his metaphysics, in the other a very serious sanction for his ethics. He felt their incompatibility, but was not prepared to undertake such a complete reconstruction of his system as would have been necessitated by altogether denying the pre-existence of the soul. Of such vacillation Plato’s later Dialogues offer, I think, sufficient evidence. For example, the Matter of the _Timacus_ seems to be a revised version of the Other or principle of division and change, which has already figured as a pure idea, in which capacity it must necessarily be opposed to matter. At the same time, I must observe that, from my point of view, it is enough if Plato inculcated the doctrine of a future life as an important element of his religious system. And that he did so inculcate it Teichmüller fully admits.[4] With regard to the _Nicomachean Ethics_, I think Teichmüller has proved this much, that it was written before Aristotle had read the _Laws_ or knew of its existence. But this does not prove that he wrote it during Plato’s lifetime, since the _Laws_ was not published until after Plato’s death, possibly not until several years after. And, published or not, Aristotle may very well have remained ignorant of its existence until his return to Athens, which, according to the tradition, took place about 336 B.C. Teichmüller does, indeed, suppose that Aristotle spent some time in Athens between his flight from Mitylênê and his engagement as tutor to Alexander (_Literarische Fehden_, p. 261). But this theory, besides its purely conjectural character, would still allow the possibility of Aristotle’s having remained unacquainted with the _Laws_ up to the age of forty. And it is obvious that the passages which Teichmüller interprets as replies to Aristotle’s criticisms admit of more than one alternative explanation. They may have originated in doubts and difficulties which spontaneously suggested themselves to Plato in the course of his independent reflections; or, granting that there is a polemic reference, it may have been provoked by some other critic, or by the spoken criticisms of Aristotle himself. For the supposition that Aristotle wrote his _Ethics_ at the early age of thirty-two or thirty-three seems to me so improbable that we should not accept it except under pressure of the strongest evidence. That a work of such matured thought and observation should have been produced by so young a man is, so far as I know, a phenomenon unparalleled in the history of literature.