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An apprentice may get a clear idea of this venting process by inspecting tubular core barrels, such as are employed in moulding pipes or hollow columns, or by examining ordinary cores about a foundry. Provision of some kind to 'carry off the vent,' as it is termed by moulders, will be found in every case. The venting of moulds is even more important than venting cores, because core vents only carry off gas generated within the core itself, while the gas from its exterior surface, and from the whole mould, has to find means of escaping rapidly from the flasks when the hot metal enters.No one will deny that the life of the Greeks was stained with foul vices, and that their theory sometimes fell to the level of their practice. No one who believes that moral truth, like all truth, has been gradually discovered, will wonder at this phenomenon. If moral conduct is a function of social life, then, like other functions, it will be subject, not only to growth, but also to disease and decay. An intense and rapid intellectual development may have for its condition a totally abnormal state of society, where certain vices, unknown to ruder ages, spring up and flourish with rank luxuriance. When men have to take women along with them on every new path of enquiry, progress will be considerably retarded, although its benefits will ultimately be shared among a greater number, and will be better insured against the danger of a violent reaction. But the work that Hellas was commissioned to perform could not wait; it had to be accomplished in a few generations, or not at all. The barbarians were forcing their way in on every side, not merely with the weight of invading armies, but with the deadlier pressure of a benumbing superstition, with the brute-worship of Egypt and the devil-worship of Phoenicia, with57 their delirious orgies, their mutilations, their crucifixions, and their gladiatorial contests. Already in the later dramas of Euripides and in the Rhodian school of sculpture, we see the awful shadow coming nearer, and feel the poisonous breath of Asia on our faces. Reason, the reason by which these terrors have been for ever exorcised, could only arrive at maturity under the influence of free and uninterrupted discussion carried on by men among themselves in the gymnasium, the agora, the eccl��sia, and the dicastery. The resulting and inevitable separation of the sexes bred frightful disorders, which through all changes of creed have clung like a moral pestilence to the shores of the Aegean, and have helped to complicate political problems by joining to religious hatred the fiercer animosity of physical disgust. But whatever were the corruptions of Greek sentiment, Greek philosophy had the power to purge them away. ��Follow nature�� became the watchword of one school after another; and a precept which at first may have meant only that man should not fall below the brutes, was finally so interpreted as to imply an absolute control of sense by reason. No loftier standard of sexual purity has ever been inculcated than that fixed by Plato in his latest work, the Laws. Isocrates bids husbands set an example of conjugal fidelity to their wives. Socrates had already declared that virtue was the same for both sexes. Xenophon interests himself in the education of women. Plato would give them the same training, and everywhere associate them in the same functions with men. Equally decisive evidence of a theoretical opposition to slavery is not forthcoming, and we know that it was unfortunately sanctioned by Plato and Aristotle, in this respect no better inspired than the early Christians; nevertheless, the germ of such an opposition existed, and will hereafter be pointed out."Just a moment," Leona said eagerly. "Suppose I deny that. How are you going to prove that I did so?"<000005>