The other narrative tells how, imprisoned, tortured inwardly by a compulsory recantation, Galileo gathered himself together and declared: "_E pu se muove_" ("it moves though"). Galileo never uttered these words; but the history of the world has uttered them for him! Yes, it moves _itself_, this earth, and in its motion it knocks everything down that is in its way. Not the earth alone moves--all that is in the world is eternal motion! Man moves--in space, and time, extensively and intensively. Truth moves, and, moving, demolishes thrones and altars. Morality moves, making ancient good uncouth. Faith moves, the human heart putting into it the pulse beat of its life, and there is no way to stop this self moving Faith. Those old stories are not true to fact, but they are true to truth. Galileo _did_ say: "It is my opinion that the earth is very noble and admirable by reason of so many and so different generations and alterations which are incessantly made therein." And Descartes joined him: "The nature of things physical is much more easily conceived when they are beheld coming gradually into existence, than when they are only considered as produced at once in a finished and perfect state." Thus these men--and many others--voiced the changed temper that was coming over the world,--the transfer of interest from the permanent to the changing. Slowly the new attitude was adopted in many departments of knowledge, but the facts of biology were apparently all against its becoming a general philosophical movement. The species of plants and animals had every appearance of being fixed and final, unchangeably stamped once for all upon the sentient world by the Creator. Not only so, but the wonderful adaptation of organism to environment, of organ to organism, a marvelous and delicate complexity of teleological adjustment, seemed to testify unanswerably to the reality of fixed and final types, to a static underpinning for all this changing order. _Origin of_ Species! That was the bomb with which Charles Darwin destroyed the last stronghold of a static world-view. "Species" is the scholastics' translation of the Greek _Eidos_, the fixed and final type or idea which is first and final cause of the changing life of each creature. Species is a synonym and epitome of fixity and finality; it is the key-word of a static other-world reality. When Darwin said, "_Origin_ of Species," he was cramming the conflict of the ancient wisdom and the modern knowledge into a bursting phrase. When he said of species what Galileo said of the earth, _e pu se muove_, he emancipated once for all genetic and experimental ideas as an _organon_ of asking questions and looking for explanations. He lifted the biological gates which had kept back the flood of change from inundating the old fields of fixity.