meaning and content of the doctrine of Kant in the important respect we are considering. What Plato says is this:—“The things of this world which our senses perceive have no true being; _they always become, they never are:_ they have only a relative being; they all exist merely in and through their relations to each other; their whole being may, therefore, quite as well be called a non-being. They are consequently not objects of a true knowledge (επιστημη), for such a knowledge can only be of what exists for itself, and always in the same way; they, on the contrary, are only the objects of an opinion based on sensation (δοξα μετ᾽ αισθησεως αλογου). So long as we are confined to the perception of these, we are like men who sit in a dark cave, bound so fast that they cannot turn their heads, and who see nothing but the shadows of real things which pass between them and a fire burning behind them, the light of which casts the shadows on the wall opposite them; and even of themselves and of each other they see only the shadows on the wall. Their wisdom would thus consist in predicting the order of the shadows learned from experience. The real archetypes, on the other hand, to which these shadows correspond, the eternal Ideas, the original forms of all things, can alone be said to have true being (οντως ον), because they _always are, but never become nor pass away_. To them belongs _no multiplicity_; for each of them is according to its nature only one, for it is the archetype itself, of which all particular transitory things of the same kind which are named after it are copies or shadows. They have also _no coming into being nor passing away_, for they are truly being, never becoming nor vanishing, like their fleeting shadows. (It is necessarily presupposed, however, in these two negative definitions, that time, space, and causality have no significance or validity for these Ideas, and that they do not exist in them.) Of these only can there be true knowledge, for the object of such knowledge can only be that which always and in every respect (thus in-itself) is; not that which is and again is not, according as we look at it.” This is Plato’s doctrine. It is clear, and requires no further proof that the inner meaning of both doctrines is entirely the same; that both explain the visible world as a manifestation, which in itself is nothing, and which only has meaning and a borrowed reality through that which expresses itself in it (in the one case the thing-in-itself, in the other the Idea). To this last, which has true being, all the forms of that phenomenal existence, even the most universal and essential, are, according to both doctrines, entirely foreign. In order to disown these forms Kant has directly expressed them even in abstract terms, and distinctly refused time, space, and causality as mere forms of the phenomenon to the thing-in-itself. Plato, on the other hand, did not attain to the fullest