Book IV, which fall unperceived on the reader’s mind, as they are

supposed at first to have fallen on the ear of Glaucon and Adeimantus. The ‘paradoxes,’ as Morgenstern terms them, of this book of the Republic will be reserved for another place; a few remarks on the style, and some explanations of difficulties, may be briefly added. First, there is the image of the waves, which serves for a sort of scheme or plan of the book. The first wave, the second wave, the third and greatest wave come rolling in, and we hear the roar of them. All that can be said of the extravagance of Plato’s proposals is anticipated by himself. Nothing is more admirable than the hesitation with which he proposes the solemn text, ‘Until kings are philosophers,’ etc.; or the reaction from the sublime to the ridiculous, when Glaucon describes the manner in which the new truth will be received by mankind. Some defects and difficulties may be noted in the execution of the communistic plan. Nothing is told us of the application of communism to the lower classes; nor is the table of prohibited degrees capable of being made out. It is quite possible that a child born at one hymeneal festival may marry one of its own brothers or sisters, or even one of its parents, at another. Plato is afraid of incestuous unions, but at the same time he does not wish to bring before us the fact that the city would be divided into families of those born seven and nine months after each hymeneal festival. If it were worth while to argue seriously about such fancies, we might remark that while all the old affinities are abolished, the newly prohibited affinity rests not on any natural or rational principle, but only upon the accident of children having been born in the same month and year. Nor does he explain how the lots could be so manipulated by the legislature as to bring together the fairest and best. The singular expression which is employed to describe the age of five-and-twenty may perhaps be taken from some poet. In the delineation of the philosopher, the illustrations of the nature of philosophy derived from love are more suited to the apprehension of Glaucon, the Athenian man of pleasure, than to modern tastes or feelings. They are partly facetious, but also contain a germ of truth. That science is a whole, remains a true principle of inductive as well as of metaphysical philosophy; and the love of universal knowledge is still the characteristic of the philosopher in modern as well as in ancient times. At the end of the fifth book Plato introduces the figment of contingent matter, which has exercised so great an influence both on the Ethics and Theology of the modern world, and which occurs here for the first time in the history of philosophy. He did not remark that the degrees of knowledge in the subject have nothing corresponding to them in the object. With him a word must answer to an idea; and he could not conceive of an opinion which was an opinion about nothing. The influence of analogy led him to invent ‘parallels and conjugates’ and to overlook facts. To us some of his difficulties are puzzling only from their simplicity: we do not perceive that the answer to them ‘is tumbling out at our feet.’ To the mind of early thinkers, the conception of not-being was dark and mysterious; they did not see that this terrible apparition which threatened destruction to all knowledge was only a logical determination. The common term under which, through the accidental use of language, two entirely different ideas were included was another source of confusion. Thus through the ambiguity of (Greek) Plato, attempting to introduce order into the first chaos of human thought, seems to have confused perception and opinion, and to have failed to distinguish the contingent from the relative. In the Theaetetus the first of these difficulties begins to clear up; in the Sophist the second; and for this, as well as for other reasons, both these dialogues are probably to be regarded as later than the Republic.