And to this we must add the further circumstance that the Greek mind was not particularly remarkable for precocity in any field except war and statesmanship. We do, indeed, find instances of comparatively juvenile authorship, but none, I believe, of a Greek writer, whether poet, historian, or philosopher, who reached the full maturity of his powers before a considerably advanced period of middle age. That the _Ethics_ is very imperfect I fully admit, and have expressly maintained against its numerous admirers in the course of this work. But, although imperfect, it is not crude. It contains as good a discussion of the subject undertaken as Aristotle was ever capable of giving, and its limitations are not those of an unripe intellect, but of an intellect at all times comparatively unsuited for the treatment of practical problems, and narrowed still further by the requirements of an elaborate speculative system. Now to work out this system must have demanded considerably more labour and independent thought than one can suppose even an Aristotle to have found time for before thirty-three; while the experience of life shown in the _Ethics_ is such as study, so far from supplying, would, on the contrary, have delayed. Moreover, the _Rhetoric_, which was confessedly written before the _Ethics_, exhibits the same qualities in about an equal degree, and therefore, on Teichmüller’s theory, testifies to a still more extraordinary precocity. And there is the further circumstance that while Aristotle is known to have begun his public career as a teacher of rhetoric, his earliest productions seem to have been of a rather diffuse and declamatory character, quite opposed to the severe concision which marks the style both of the _Rhetoric_ and of the _Ethics_. In addition to these general considerations, one may mention that in a well-known passage of the _Ethics_, referring to a question of logical method (I., iv.), Plato is spoken of in the imperfect tense, which would seem to imply that he was no longer living when it was written. Speaking from memory, I should even be inclined to doubt whether the mention of a living writer by name at all is consistent with Aristotle’s standard of literary etiquette.