TWO:To illustrate the relation in which Plato stood towards his own times, we have already had occasion to draw largely on the productions of his maturer manhood. We have now to take up the broken thread of our systematic exposition, and to trace the development of his philosophy through that wonderful series of compositions which entitle him to rank among the greatest writers, the most comprehensive thinkers, and the purest religious teachers of all ages. In the presence of such glory a mere divergence of opinion must not be permitted to influence our judgment. High above all particular truths stands the principle that truth itself exists, and it was for this that Plato fought. If there were others more completely emancipated from superstition, none so persistently appealed to the logic before which superstition must ultimately vanish. If his schemes for the reconstruction of society ignore many obvious facts, they assert with unrivalled force the necessary supremacy of public welfare over private pleasure; and their avowed utilitarianism offers a common ground to the rival reformers who will have nothing to do with the mysticism of their metaphysical foundation. Those, again, who hold, like the youthful Plato himself, that the203 ultimate interpretation of existence belongs to a science transcending human reason, will here find the doctrines of their religion anticipated as in a dream. And even those who, standing aloof both from theology and philosophy, live, as they imagine, for beauty alone, will observe with interest how the spirit of Greek art survived in the denunciation of its idolatry, and the light that never was on sea or land, after fading away from the lower levels of Athenian fancy, came once more to suffuse the frozen steeps of dialectic with its latest and divinest rays.

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THREE:The Stoics held, as Mr. Herbert Spencer, who resembles them in so many respects, now holds, that all knowledge is ultimately produced by the action of the object on the subject. Being convinced, however, that each single perception, as such, is fallible, they sought for the criterion of certainty in the repetition and combination of individual impressions; and, again like Mr. Spencer, but also in complete accordance with their dynamic theory of Nature, they estimated the validity of a belief by the degree of tenacity with which it is held. The various stages of assurance were carefully distinguished and arranged in an ascending series. First came simple perception, then simple assent, thirdly, comprehension, and finally demonstrative science. These mental acts were respectively typified by extending the forefinger, by bending it as in the gesture of beckoning, by clenching the fist, and by placing it, thus clenched, in the grasp of the other hand. From another point of view, they defined a true conviction as that which can only be produced by the action of a corresponding real object on the mind.147 This theory was complicated still further by the Stoic interpretation of judgment as a voluntary act; by the ethical significance which it consequently received; and by the concentration of all wisdom in the person of an ideal sage. The unreserved bestowal of belief is a practical postulate dictated by the necessities of life; but only he who knows what those necessities are, in other words only the wise man, knows when the postulate is to be enforced. In short, the criterion of your being right is your conviction that you are right, and this conviction, if you really possess it, is a sufficient witness to its own veracity. Or again, it is the nature of man to act rightly, and he cannot do so unless he has right beliefs, confirmed and clinched by the consciousness that they are right.
- 1Under the distillation system, even in case of azeotropic solvent compositions, this system which remove water vapor by the polyimide membrane will easily dehydrate.
- 2In comparison with the distillation system, it significantly saves on use of steam.
- 3Dehydration can be performed through merely supplying evaporated vapor to the membrane module and maintaining the differential pressure between the permeable side and the impermeable side.
- 4Solvent purity of 99.9% or more can be achieved by carrying out dehydration with a polyimide membrane only.
- 5The polyimide membrane has superior heat and solvent resistance. Therefore, the vapor permeation system reduces contamination of the membrane and thus extends its life.
THREE:387
The aromatic polyimide membrane is highly permeable to water vapor but less permeable to vapors of organic compounds such as alcohol etc.
THREE:Epicureanism allotted a far larger place to friendship than to all the other social virtues put together; and the disciple was taught to look to it not only for the satisfaction of his altruistic impulses, but for the crowning happiness of his life. The egoistic basis of the system was, indeed, made sufficiently prominent even here; utility and pleasure, which Aristotle had excluded from the notion of true friendship, being declared its proper ends. All the conditions of a disinterested attachment were, however, brought back by a circuitous process. It was argued that the full value of friendship could not be reaped except by those whose affection for each other went to the extent of complete self-devotion; but the Epicureans were less successful in showing how this happy condition could be realised consistently with the study of his own interest by each individual. As a matter of fact, it was realised; and the members of this school became remarkable, above all others, for the tenderness and fidelity of their personal attachments. But we may suspect that formal precepts had little to do with the result. Estrangement from the popular creed, when still uncommon, has always a tendency to draw the dissidents together;151 and where other ties, whether religious, domestic, or patriotic, are neglected, the ordinary instincts of human nature are likely to show themselves with all the more energy in the only remaining form of union. Moreover, the cheerful, contented, abstemious, unambitious characters who would be the most readily75 attracted to the Epicurean brotherhood supplied the very materials that most readily unite in placid and enduring attachments. A tolerably strict standard of orthodoxy provided against theoretical dissensions: nor were the new converts likely to possess either daring or originality enough to excite controversies where they did not already exist.Lalage saw the beautiful force of the argument. Besides, he was not anxious to die yet. His own bitter regret was that he had not completed his mission. If he had only known that his dalliance with opportunity had proved his own undoing he would have been moved to a deeper and fiercer anger.
- 1 Recovery of the detergent solvent Recovery of the cleaning solvent such as electronic parts industry, precision instrument industry.
- 2Solvent recovery and the refinement Solvent recovery and the refinement such as chemical industry, an industry of medical supplies, food industry, the fermentation industry.
THREE:Second. The amount of gain so derived is as the difference between the cost of constructing machinery, and the market value of the machinery when completed.
Acetone, ethanol, methyl ethyl ketone, butanol, isopropyl alcohol, ethyl acetate, methyl isobutyl ketone, others (including hexane and toluene).