It may be practically admitted that no philosophy allows of strict demonstration, since, being a conception of the totality of things, it modifies our understanding of every principle by which one might attempt to prove or disprove it. Eventually it is its harmony with the totality of things as we perceive them that determines us to accept it, and no two of us perceive just the same totality, however substantial an agreement there may be in our experience; yet I think it can hardly be denied that this conception of evolution is far more in agreement with the world as most of us know it, and commonly think and speak of it, than the former; that it not merely satisfies our intellect, but offers some satisfaction to our whole spiritual nature. "Is it certain," asks Mr. Bradley, in a fairly similar connection, "that the mere intellect can be self-satisfied if the other elements of our nature remain uncontented?" And, again: "A result, if it fails to satisfy our whole nature, comes short of perfection: and I could not rest tranquilly in a truth if I were compelled to regard it as hateful.... I should insist that the inquiry was not yet closed and that the result was but partial. And if metaphysics" [for which we may substitute: any philosophy, such a& that of Evolution] "is to stand, it must, I think, take account of all sides of our being. I do not mean that every one of our desires must be met by a promise of particular satisfaction; for that would be absurd and utterly impossible. But if the main tendencies of our nature do not reach consummation in the Absolute, we cannot believe that we have attained to perfection and truth."[7] From this point of view there can be no doubt as to which of these conceptions of Evolution is the more rational and satisfactory; that which would explain it by a simple tendency in living matter to persist and spread, and would see in all organic variety only the selected means to that somewhat colourless end; or that conception which would explain it by a tendency in living matter to come into ever fuller correspondence with its environment, seeing in such spontaneous correspondence the very essence of life, and not merely a condition of life. We need only add a few criticisms on this second conception.