The principles most fundamental and dominant in his thought are perhaps the following: That the objects the mind deals with, whether material or ideal, are what and where the mind says they are, and independent of it; that some general principles and ideas have to be assumed to be valid not merely for thought but for things; that relations may subsist, arise, and disappear between things without at all affecting these things internally; and that the nature of everything is just what it is, and not to be confused either with its origin or with any opinion about it. These principles, joined with an obvious predilection for Plato and Leibnitz among philosophers, lead to the following doctrines, among others: that the mind or soul is an entity separate from its thoughts and pre-existent; that a material world exists in space and time; that its substantial elements may be infinite in number, having position and quality, but no extension, so that each mind or soul might well be one of them; that both the existent and the ideal worlds may be infinite, while the ideal world contains an infinity of things not realised in the actual world; and that this ideal world is knowable by a separate mental consideration, a consideration which is, however, empirical in spirit, since the ideal world of ethics, logic, and mathematics has a special and surprising constitution, which we do not make but must attentively discover. The reader will perceive, perhaps, that if the function of philosophy is really, as the saying goes, to give us assurance of God, freedom, and immortality, Mr. Russell's philosophy is a dire failure. In fact, its author sometimes gives vent to a rather emphatic pessimism about this world; he has a keen sense for the manifold absurdities of existence. But the sense for absurdities is not without its delights, and Mr. Russell's satirical wit is more constant and better grounded than his despair. I should be inclined to say of his philosophy what he himself has said of that of Leibnitz, that it is at its best in those subjects which are most remote from human life. It needs to be very largely supplemented and much ripened and humanised before it can be called satisfactory or wise; but time may bring these fulfilments, and meantime I cannot help thinking it auspicious in the highest degree that, in a time of such impressionistic haste and plebeian looseness of thought, scholastic rigour should suddenly raise its head again, aspiring to seriousness, solidity, and perfection of doctrine: and this not in the interests of religious orthodoxy, but precisely in the most emancipated and unflinchingly radical quarter. It is refreshing and reassuring, after the confused, melodramatic ways of philosophising to which the idealists and the pragmatists have accustomed us, to breathe again the crisp air of scholastic common sense. It is good for us to be held down, as the Platonic Socrates would have held us, to saying what we really believe, and sticking to