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FORE:Sixth.��Inherent, or cooling strains, that may either spring and warp castings, or weaken them by maintained tension in certain parts��a condition that often requires a disposition of the metal quite different from what working strains demand.Modern admirers of Aristotle labour to prove that his errors were inevitable, and belonged more to his age than to himself; that without the mechanical appliances of modern times science could not be cultivated with any hope of success. But what are we to say when we find that on one point after another the true explanation had already been surmised by Aristotle��s predecessors or contemporaries, only to be scornfully rejected by Aristotle himself? Their hypotheses may often have been very imperfect, and supported by insufficient evidence; but it must have been something more than chance which always led him wrong when they were so often right. To begin with, the infinity of space is not even now, nor will it ever be, established by improved instruments of observation and measurement; it is deduced by a very simple process of reasoning, of which Democritus and others were capable, while Aristotle apparently was not. He rejects the idea because it is inconsistent with certain very arbitrary assumptions and definitions of his own, whereas he should have313 rejected them because they were inconsistent with it. He further rejects the idea of a vacuum, and with it the atomic theory, entirely on �� priori grounds, although, even in the then existing state of knowledge, atomism explained various phenomena in a perfectly rational manner which he could only explain by unmeaning or nonsensical phrases.195 It had been already maintained, in his time, that the apparent movements of the heavenly bodies were due to the rotation of the earth on its own axis.196 Had Aristotle accepted this theory one can imagine how highly his sagacity would have been extolled. We may, therefore, fairly take his rejection of it as a proof of blind adherence to old-fashioned opinions. When he argues that none of the heavenly bodies rotate, because we can see that the moon does not, as is evident from her always turning the same side to us,197 nothing is needed but the simplest mathematics to demonstrate the fallacy of his reasoning. Others had surmised that the Milky Way was a collection of stars, and that comets were bodies of the same nature as planets. Aristotle is satisfied that both are appearances like meteors, and the aurora borealis��caused by the friction of our atmosphere against the solid aether above it. A similar origin is ascribed to the heat and light derived from the sun and stars; for it would be derogatory to the dignity of those luminaries to suppose, with Anaxagoras, that they are formed of anything so familiar and perishable as fire. On the contrary, they consist of pure aether like the spheres on which they are fixed as protuberances; though314 how such an arrangement can co-exist with absolute contact between each sphere and that next below it, or how the effects of friction could be transmitted through such enormous thicknesses of solid crystal, is left unexplained.198 By a happy anticipation of Roemer, Empedocles conjectured that the transmission of light occupied a certain time: Aristotle declares it to be instantaneous.199

FORE:The influence of Aristotle has, indeed, continued to make itself felt not only through the teaching of his modern imitators, but more directly as a living tradition in literature, or through the renewed study of his writings at first hand. Even in the pure sciences, it survived until a comparatively recent period, and, so far as the French intellect goes, it is not yet entirely extinct. From Ab��lard on, Paris was the headquarters of that soberer scholasticism which took its cue from the Peripatetic logic; and the resulting direction of thought, deeply impressed as it became on the French character and the French language, was interrupted rather than permanently altered by the Cartesian revolution, and, with the fall of Cartesianism, gradually recovered its old predominance. The Aristotelian philosophy is remarkable above all others for clear definitions, full descriptions, comprehensive classifications, lucid reasoning, encyclopaedic science, and disinterested love of knowledge; along with a certain incapacity for ethical speculation,576 strong conservative leanings, and a general tendency towards the rigid demarcation rather than the fruitful commingling of ideas. And it will probably be admitted429 that these are also traits characteristic of French thinking as opposed to English or German thinking. For instance, widely different as is the M��canique C��leste from the astronomy of Aristotle��s treatise On the Heavens, both agree in being attempts to prove the eternal stability of the celestial system.577 The destructive deluges by which Aristotle supposes civilisation to be periodically interrupted, reappear on a larger scale in the theory of catastrophes still held by French geologists. Another Aristotelian dogma, the fixity of organic species, though vigorously assailed by eminent French naturalists, has, on the whole, triumphed over the opposite doctrine of transformism in France, and now impedes the acceptance of Darwin��s teaching even in circles where theological prepossessions are extinct. The accepted classifications in botany and zoology are the work of Frenchmen following in the footsteps of Aristotle, whose genius for methodical arrangement was signally exemplified in at least one of these departments; the division of animals into vertebrate and invertebrate being originally due to him. Bichat��s distinction between the animal and the vegetable functions recalls Aristotle��s distinction between the sensitive and nutritive souls; while his method of studying the tissues before the organs is prefigured in the treatise on the Parts of Animals. For a long time, the ruling of Aristotle��s Poetics was undisputed in French criticism; and if anything could disentitle Montesquieu��s Esprit des Lois to the proud motto, Prolem sine matre creatam, it would be its close relationship to the Politics of the same universal master. Finally, if it be granted that the enthusiasm for knowledge, irrespective of its utilitarian applications, exists to a greater degree among the educated classes of France than in any other modern society, we may plausibly attribute this honourable characteristic to the fostering influence of one who has430 proclaimed more eloquently than any other philosopher that theoretical activity is the highest good of human life, the ideal of all Nature, and the sole beatitude of God.