The fifth book is the new beginning of the Republic, in which the community of property and of family are first maintained, and the transition is made to the kingdom of philosophers. For both of these Plato, after his manner, has been preparing in some chance words of 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.