But just as according to the vulgar superstition the tail of a snake that has been killed wiggles till sundown, so this book of Mallock's is merely a false show of life made by a theory that received its deathblow long since. It is the wiggling of the tail of the snake that Herbert Spencer killed thirty years ago with his little book "The Study of Sociology." The environment philosophy in one form or another has come to occupy the entire field of human thought. We now look for the explanation of every phenomenon in the conditions that surrounded its birth and development. The best application of this environment philosophy to intellectual and literary phenomena that has ever been made is Taine's History of English Literature. But while Spencer's Study of Sociology is the most signal and brilliant refutation of the Great Man theory, no one man really killed that theory. The general spread and acceptance of Darwinism has produced an intellectual atmosphere in which such a theory can no more live than a fish can live out of water. By Darwinism we mean, as you know, the transmutation of species by variation and natural selection--selection accomplished mainly, if not solely, by the struggle for existence. Now this doctrine of organic development and change or metamorphic evolution, which was, with its originators, Wallace and Darwin, a purely biological doctrine, was transported to the field of sociology by Spencer and applied with great power to all human institutions, legal, moral, economic, religious, etc. Spencer has taught the world that all social institutions are fluid and not fixed. As Karl Marx said in the preface to the first edition of Capital: "The present society is no solid crystal, but an organization capable of change, and is constantly changing," and again in the preface to the second edition, "Every historically developed social form is in fluid movement." This is the theory of Evolution in its broadest sense, and it has struck a death-blow to the conception of Permanence so dear to the hearts of the bourgeoisie who love to sing to their Great God, Private Property, "As it was in the beginning, is now and ever shall be, world without end. Amen." "_Saecula saeculorum._" "For the Ages of Ages." Before natural science had thus revolutionized the intellectual atmosphere, great men proclaiming the doctrines of modern socialism might have been rained down from Heaven, but there would have been no socialist movement. In fact many of its ideas had found utterance centuries before, but the economic conditions, and consequently the intellectual conditions were not ripe, and these ideas were still-born, or died in infancy. The general acceptance of the idea that all things change, that property, marriage, religion, etc., are in process of evolution and are destined to take on new forms prepared the way for Socialism. A man who has read Wallace and Darwin is ready to read Marx and Engels.