There is a notion, more familiar than correct, that Greek thought sacrificed the individual to the state. None has ever known better than the Greek that the individual comes to himself and to his own only in association with others. But Greek thought subjected, as we have seen, both state and individual to an external cosmic order; and thereby it inevitably restricted the free use in doubt, inquiry, and experimentation, of the human intelligence. The _anima libera_, the free mind of the sixteenth century, of Galileo and his successors, was the counterpart of the disintegration of cosmology and its animistic teleology. The lecturer on political economy reminded us that his subject began, in the Middle Ages, as a branch of ethics, though, as he hastened to show, it soon got into better association. Well, the same company was once kept by all the sciences, mathematical and physical as well as social. According to all accounts it was the integrity of the number one and the rectitude of the square that attracted the attention of Pythagoras to arithmetic and geometry as promising fields of study. Astronomy was the projected picture book of a cosmic object lesson in morals, Dante’s transcript of which is none the less literal because poetic. If physics alone remained outside the moral fold, while noble essences redeemed chemistry, occult forces blessed physiology, and the immaterial soul exalted psychology, physics is the exception that proves the rule: matter was so inherently immoral that no high-minded science would demean itself by contact with it. If we do not join with many in lamenting the stripping from nature of those idealistic properties in which animism survived, if we do not mourn the secession of the sciences from ethics, it is because the abandonment by intelligence of a fixed and static moral end was the necessary precondition of a free and progressive science of both things and morals; because the emancipation of the sciences from ready made, remote, and abstract values was necessary to make the sciences available for creating and maintaining more and specific values here and now. The divine comedy of modern medicine and hygiene is one of the human epics yet to be written; but when composed it may prove no unworthy companion of the medieval epic of other worldly beatific visions. The great ideas of the eighteenth century, that expansive epoch of moral perception which ranks in illumination and fervor along with classic Greek thought, the great ideas of the indefinitely continuous progress of humanity and of the power and significance of freed intelligence, were borne by a single mother--experimental inquiry.