Every day, however, in spite of such half-ignorant adherents, the effects of true Darwinism are widening and deepening. One group of earnest workers is using it now as a guide to physiological, embryological, and anatomical researches. Another is employing it with zeal and skill in the field of classificatory and physiological botany. Yet others are working out its psychological implications, enquiring into instinct and animal intelligence, and solving by its aid abstruse problems of the human mind and the human emotions. One philosopher has brought it to bear on questions of ethics, another on questions of social and political economy. Its principles have been applied in one place to æsthetics, in another place to logic, in a third place to the origin and growth of religion. The study of language has derived new lights from the great central Darwinian luminary. The art of education is beginning to feel the progressive influence of the Darwinian impulse. In fact, there is hardly a single original worker in any department of thought or science who has not been more or less profoundly affected, whether he knows it or whether he knows it not, by the vast spreading and circling wave of the Darwinian conceptions. All our ideas have been revolutionised and evolutionised. The new notions are abroad in the world, quickening with their fresh and vigorous germinal power the dry bones of all the sciences, all the arts, and all the philosophies. And evolutionism is gradually though slowly filtering downward. It is permeating the daily press of the nations, and gaining for its vocabulary a recognised place in the phraseology of the unlearned vulgar. Such expressions as 'natural selection,' 'survival of the fittest,' 'struggle for existence,' 'adaptation to the environment,' and all the rest of it, are becoming as household words upon the lips of thousands who only know the name of Darwin as a butt for the petty empty jibes of infinitesimal cheap witlings. And Darwinism will trickle down still through a thousand channels, by definite popularisation, and still more by indefinite absorption into the common thought of universal humanity, till it becomes part and parcel of the general inheritance, bred in our bone and burnt into our blood, an heir-loom of our race to all time and in all countries. Great thoughts like his do not readily die: they expand and grow in ten thousand bosoms, till they transform the world at last into their own likeness, and adapt it to the environment they have themselves created by their informing power.