B.C. Aristæus writes a treatise on conic sections, 380 Dionysius invents catapultæ, 399 Aristotle, the founder of the Peripatetics, logician and philosopher, Plato, Diogenes, Demosthenes (Philippics), etc., 368 Gausias of Sycion invents caustic painting, the art of burning colors into wood and ivory, 335 Lysistratus invents molds from which to cast wax figures, 328 The gnomon is invented or constructed to measure altitudes, Euclid of Alexandria writes his celebrated Mathematics, that has never been contradicted or modified, and is used at the present day, 300 Dionysius the astronomer at Alexandria finds the solar year to consist of 365 days 5 hours and 49 minutes, Archimedes the mathematician demonstrates the property of a lever and other mechanical powers, also the art of measuring solids and surfaces and conic sections, and constructs a planetarium, The art of making paper and printing invented by the Chinese, 200 Attalus, king of Pergamos, introduces a book with leaves of vellum, instead of rolls, Pasidonius calculates the hight of the atmosphere to be 800 stadia, Scipio Nascia invents a water clock, Hipparchus lays the foundation of trigonometry, fixes the first degree of longitude, the meridian, These few citations I hope will be convincing proof of the progress made, thus showing that men were observing, reasoning, calculating, governed by demonstration and proof. It would have been impossible for Moses, or any other man, to perform miracles of the nature theologians believe, at the time of Christ. Two conditions are always necessary for every miracle--profound ignorance on the one hand, and a clever fraud on the other. There are, however, another class of miracles, that are at all times in order; that are played and plied on human failing and human weakness, always coupled with ignorance on the one side, and dishonest scoundrelism, a fraud by a priest or church mountebank, on the other. In disturbances of nature, no one believes unless he has ocular proof and demonstration, knowing that these things are subject to natural laws and no one man could produce an earthquake or a thunderstorm. No man could stop the current of the Mississippi river either by praying or by throwing a stick over it. What we can do, that has the appearance of a miracle, is to play upon the susceptibilities, failings, weaknesses, and imaginations of ignorant human nature. These cure-alls, these medical wonder-workers, these spiritual charlatans, these theological miracle-mongers, these fanatical frauds, were introduced more prominently in the Bible story by the celebrated political agitators Elijah and Elisha.