the division of the mind into the rational, concupiscent, and irascible elements, or of pleasures and desires into necessary and unnecessary --these and other great forms of thought are all of them to be found in the Republic, and were probably first invented by Plato. The greatest of all logical truths, and the one of which writers on philosophy are most apt to lose sight, the difference between words and things, has been most strenuously insisted on by him, although he has not always avoided the confusion of them in his own writings. But he does not bind up truth in logical formulae, --logic is still veiled in metaphysics; and the science which he imagines to "contemplate all truth and all existence" is very unlike the doctrine of the syllogism which Aristotle claims to have discovered. Neither must we forget that the Republic is but the third part of a still larger design which was to have included an ideal history of Athens, as well as a political and physical philosophy. The fragment of the Critias has given birth to a world-famous fiction, second only in importance to the tale of Troy and the legend of Arthur; and is said as a fact to have inspired some of the early navigators of the sixteenth century. This mythical tale, of which the subject was a history of the wars of the Athenians against the Island of Atlantis, is supposed to be founded upon an unfinished poem of Solon, to which it would have stood in the same relation as the writings of the logographers to the poems of Homer. It would have told of a struggle for Liberty, intended to represent the conflict of Persia and Hellas. We may judge from the noble commencement of the Timaeus, from the fragment of the Critias itself, and from the third book of the Laws, in what manner Plato would have treated this high argument. We can only guess why the great design was abandoned; perhaps because Plato became sensible of some incongruity in a fictitious history, or because he had lost...
