In the _Principles of Ethics_ (1892-1893) Mr. Spencer attempts to apply the results reached in the earlier parts of his scheme to the enunciation of a theory of right living. It is here that an evolutionary system based upon science is felt to be least convincing. There is a gulf never satisfactorily bridged between ethical principles as gradually evolved out of the non-moral state, and the 'moral imperative' as it is felt by the human conscience. Hence, the man of religion insists, the necessity of being specific about that vague Power dimly seen behind the philosophy of evolution; and hence the necessity, in the view of the metaphysician, of regarding evolution from above as well as from below. We learn much by tracing things to their origin; but to learn all we must consider as well what they ultimately become. It is in fact the final form that gives importance to the question of origin. The temptation of evolution is certainly to underrate the significance of the later stages; and the higher we go the greater are the effects of such an error. But whatever its faults the _Synthetic Philosophy_ remains unequalled in the present age for boldness of conception and for the solidity derived from its league with science. No other philosophy is so eminently modern in spirit and method; and whatever modifications may prove to be required, thought at once so daring and so patient can never be ignored. CHAPTER VIII. SCIENCE. The achievements of science as a rule hardly come within the purview of the critic of literature, for language is commonly used by science for a purpose other than that of literary expression, and even when science is popularised by writers like Mary Somerville the result is apt to be something not very valuable for its substance nor yet for its style. Nevertheless, all science may indirectly, and some of it does directly, influence literature. In point of fact, this influence has been one of the great features of the present century. We see it on the one hand as a force of attraction, on the other as a force of repulsion; for while some have been fired with the hope of human progress, others have been chilled by the fear of its materialising tendency. Both classes have been prone to exaggerate the mere mechanical results of science and to forget that its true aim is knowledge, not machines. It is however in the sphere of ideas that we must look for its effect upon literature. Whether we travel by railways or by stage-coaches, whether we transmit our messages by letter or by telegraph, matters little; but it matters much whether we are hopeful or despondent, whether we feel that there is no new thing under the sun, or are inspired by ideas that seem to open new worlds to our intellect. We must ask then, in the first place, what is the effect of science on the spirit of men and their view of life; and in the second place, what are the scientific ideas which directly and in themselves