The sources—Vitruvius depicts architecture as free from magic—But himself believes in occult virtues and perfect numbers—Also in astrology—Divergence between theory and practice, learning and art—Evils in contemporary learning—Authorities and inventions—Machines and Ctesibius—Hero of Alexandria—Medieval working over of the texts—Hero’s thaumaturgy—Instances of experimental proof—Magic jugs and drinking animals—Various automatons and devices—Magic mirrors—Astrology and occult virtue—Date of extant Greek alchemy—Legend that Diocletian burned the books of the alchemists—Alchemists’ own accounts of the history of their art—Close association of Greek alchemy with magic—Mystery and allegory—Experiment: relation to science and philosophy. “_doctum ex omnibus solum neque in alienis locis peregrinum ... sed in omni civitate esse civem._” —_Vitruvius, VI, Introd. 2._ [Sidenote: The sources.] This chapter will examine what may be called ancient applied science and its relations to magic, taking observations at three different points, the ten books of Vitruvius on architecture, the collection of writings which pass under the name of Hero of Alexandria, and the compositions of the Greek alchemists. The remains of Greek and Roman literature in the field of applied science are scanty, not because they were not treasured, and even added to, by the periods following, but apparently because there had thus far been so little development in the way of machinery or of power other than manual and animal. So we must make the best of what we have. The writings to be considered are none of them earlier than the period of the Roman Empire but like other writings of that time they more or less reflect the scientific achievements or the occult lore of the preceding Hellenistic period. [Sidenote: Vitruvius depicts architecture as free from magic.] Vitruvius lived just at the beginning of the Empire under Julius and Augustus Caesar. He is not much of a writer, but architecture as set forth in his book appears sane, straightforward, and solid. The architect is represented as going about his business with scarcely any admixture of magical procedure or striving after marvelous results. The combined guidance of practical utility and of high standards of art—Vitruvius stresses reality and propriety now and again, and has little patience with mere show—perhaps accounts for this high degree of freedom from superstition. Perhaps permanent building is an honest, downright, open, constructive art where error is at once apparent and superstition finds little hold. If so, one wonders how there came to be so much mystery enveloping Free-Masonry. At any rate, not only in his building directions, but even in his instructions for the preparation of lime, stucco, and bricks, or his discussion of colors, natural and artificial, Vitruvius seldom or never embodies anything that can be called magical.[858] [Sidenote: Occult virtue and number.]