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ONE:Subsequently, with the revival of Hellenism, the Greek oracles broke silence, and regained even more than their ancient reputation, as the increased facilities for locomotion now rendered them accessible from the remotest regions.343 Sometimes the miraculous character of their responses resulted in the conversion of hardened infidels. In this connexion, the following anecdote is related by Plutarch. A certain governor of Cilicia entertained serious doubts about the gods, and was still further confirmed in his impiety by the Epicureans who surrounded him. This man, for the purpose of throwing discredit on the famous oracle of Mopsus, sent a freedman to consult it, bearing a sealed letter containing a question with whose purport neither he nor any one else except the sender was acquainted. On arriving at the oracle, the messenger was admitted to pass a night within the temple, which was the method of consultation usually practised there. In his sleep a beautiful figure appeared to him, and after uttering the words ��a black one,�� immediately vanished. On hearing this answer the governor fell on his knees in consternation, and, opening the sealed tablet, showed his friends the question which it contained, ��Shall I sacrifice a white or a black bull to thee?�� The Epicureans were confounded; while the governor offered up the prescribed sacrifice, and became thenceforward a constant adorer of Mopsus.344To make this plainer, the laws of forces, the proportion of parts, strength of material, and so on, are subjects of general knowledge that may be acquired from books, and understood without the aid of an acquaintance with the technical conditions of either the mode of constructing or the manner of operating machines; but how to construct proper patterns for castings, or how the parts of machinery should be moulded, forged, or fitted, is special knowledge, and must have reference to particular cases. The proportions of pulleys, bearings, screws, or other regular details of machinery, may be learned from general rules and principles, but the hand skill that enters into the manufacture of these articles cannot be learned except by observation and experience. The general design, or the disposition of metal in machine-framing, can be to a great extent founded upon rules and constants that have general application; but, as in the case of wheels, the plans of moulding such machine frames are not governed by constant rules or performed in a uniform manner. Patterns of different kinds may be employed; moulds may be made in various ways, and at a greater and less expense; the metal can be mixed to produce a hard or a soft casting, a strong or a weak one; the conditions under which the metal is poured may govern the soundness or shrinkage,��things that are determined by special instead of general conditions.