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THREE:It is interesting to observe how, here also, the positive science of the age had a large share in determining its philosophic character. Founded on the discovery of the earth��s true shape, Aristotle��s metaphysics had been overthrown by the discovery of the earth��s motion. And now the claims of Cartesianism to have furnished an exact knowledge of matter and a definition of it whence all the facts of observation could be deduced �� priori, were summarily refuted by the discovery421 of universal gravitation. The Cartesians complained that Newton was bringing back the occult qualities of the Schoolmen; but the tendency of bodies to move towards one another proved as certain as it was inexplicably mysterious. For a time, the study of causes was superseded by the study of laws; and the new method of physical science moved in perfect harmony with the phenomenism of Locke. One most important consequence of this revolution was to place the new Critical philosophy on a footing quite different from that occupied by the ancient sceptics. Both restricted certain knowledge to our own states of consciousness; but it now appeared that this might be done without impeaching the value of accepted scientific conclusions, which was more than the Academic philosophy would have admitted. In other words, granting that we were limited to phenomena, it was shown that science consisted in ascertaining the relations of these phenomena to one another, instead of to a problematic reality lying behind them; while, that such relations existed and were, in fact, part of the phenomena themselves, was what no sceptic could easily deny.A learner will no doubt wonder why sand is used for moulding, instead of some more adhesive material like clay. If he is not too fastidious for the experiment, and will apply a lump of damp moulding sand to his mouth and blow his breath through the mass, the query will be solved. If it were not for the porous nature of sand-moulds they would be blown to pieces as soon as the hot metal entered them; not only because of the mechanical expansion of the gas, but often from explosion by combustion. Gas jets from moulds, as may be seen at any time when castings are poured, will take fire and burn the same as illuminating gas.

THREE:Among the scientific and literary men who were not pledged to any particular school, we find the elder Pliny rejecting the belief in immortality, not only as irrational but235 as the reverse of consolatory. It robs us, he declares, of Nature��s most especial boon, which is death, and doubles the pangs of dissolution by the prospect of continued existence elsewhere.361 Quintilian leaves the question undecided;362 Tacitus expresses himself doubtfully;363 and Galen, whose great physiological knowledge enabled him to see how fallacious were Plato��s arguments, while his philosophical training equally separated him from the materialists, also refuses to pronounce in favour of either side.364 What Juvenal thought is uncertain; but, from his general tone, we may conjecture that he leant to the negative side.365