of the perfect have been given, we can understand the connection. But in no case will he admit that the concept formed from the earlier phases is, in itself, sufficient for deducing from it the later phases. From this it follows for Ethics that, whilst we can understand the connection of later moral concepts with earlier ones, it is not possible to deduce a single new moral idea from earlier ones. The individual, as a moral being, produces his own content. This content, thus produced, is for Ethics a datum, as much as reptiles are a datum for Natural Science. Reptiles have evolved out of the Proto-Amniotes, but the scientist cannot manufacture the concept of reptiles out of the concept of the Proto-Amniotes. Later moral ideas evolve out of the earlier ones, but Ethics cannot manufacture out of the moral principles of an earlier age those of a later one. The confusion is due to the fact that, as scientists, we start with the facts before us, and then make a theory about them, whereas in moral action we first produce the facts ourselves, and then theorise about them. In the evolution of the moral world-order we accomplish what, at a lower level, Nature accomplishes: we alter some part of the perceptual world. Hence the ethical norm cannot straightway be made an object of knowledge, like a law of nature, for it must first be created. Only when that has been done can the norm become an object of knowledge. But is it not possible to make the old a measure for the new? Is not every man compelled to measure the deliverances of his moral imagination by the standard of traditional moral principles? If he would be truly productive in morality, such measuring is as much an absurdity as it would be an absurdity if one were to measure a new species in nature by an old one and say that reptiles, because they do not agree with the Proto-Amniotes, are an illegitimate (degenerate) species. Ethical Individualism, then, so far from being in opposition to the theory of evolution, is a direct consequence of it. Haeckel's genealogical tree, from protozoa up to man as an organic being, ought to be capable of being worked out without a breach of natural law, and without a gap in its uniform evolution, up to the individual as a being with a determinate moral nature. But, whilst it is quite true that the moral ideas of the individual have perceptibly grown out of those of his ancestors, it is also true that the individual is morally barren, unless he has moral ideas of his own. The same Ethical Individualism which I have developed on the basis of the preceding principles, might be equally well developed on the basis of the theory of evolution. The final result would be the same; only the path by which it was reached would be different.