This suggests one other point which requires consideration. Mr. Kidd regards it as proved that progress has been due to the Christian religion, which revealed the new moral doctrine. The Christian religion introduced, it seems, that belief in the supernatural which is essential to altruism. It seems to me to be inconsistent with his own principles, that he should attribute progress to what is essentially, on his own showing, an intellectual change: that is, to a change in belief and even to a change which, in comparison with the old polytheism, was distinctly sceptical and rationalistic. But one point is clear. The introduction of Christianity may be interpreted more consistently in a totally different way. The Greek who became a Christian was not provided with a new set of emotions, but his emotions were directed into new channels. He ceased to care for Athens, because Athens had ceased to be an independent State; he began to be cosmopolitan when he was forced to be part of a cosmopolitan empire. The important distinction was no longer the distinction between Athenian and Spartan, but between the different classes in the world-wide system. That is to say, the "altruism" which came in with Christianity was not the product of a new dogma suddenly dropped from heaven; but of the new social condition, which made it inevitable that the forces which previously stimulated a local patriotism should now exert themselves nearer a cosmopolitan organisation. This is, of course, a commonplace; but, for that reason, it should not be simply ignored. It suggests one other consequence of Mr. Kidd's theory. It is proved, he says, that the progress of the Western world is due to Christianity. His "proof," as I suppose, is that the States which have sprung out of the old Empire of the West have been Christian and have progressed. How, then, about the Empire of the East? If the great Kingdoms of the West are the unique example of progress, what is the unique example of decay? Surely, the regions where Christian dogmatic theology was defended by Athanasius and Chrysostom. If you wish to point out a region where the race has actually gone backwards, you would refer to the Turkish Empire. Why, if Christianity was the sole cause of progress in one quarter, was it comparable with complete decay in the other? Does the Eastern theory about the _filioque_ explain it? Or were the Mohammedans more "altruistic" than the Christians? Or is it that it is absurd, especially upon Mr. Kidd's own doctrine, to assign the dogmatic creed of a race as the sole cause of its character and its success in the struggle for existence?