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to the development of hypotheses at once more extensive and more exact, and point to new experiments, which in their turn furnish new problems to solve. 'So necessity perfects the instrument; so mathematics finds support in physics, to which it lends its lamp; so all knowledge is bound together; so, notwithstanding the diversity of their advance, all the sciences lend one another mutual aid; and so, by force of feeling a way, of multiplying systems, of exhausting errors, so to speak, the world at length arrives at the knowledge of a vast number of truths.' It might seem as if a prodigious confusion, as of tongues, would arise from so enormous an advance along so many lines. 'The different sciences, originally confined within a few simple notions common to all, can now, after their advance into more extensive and difficult ideas, only be surveyed apart. But an advance, greater still, brings them together again, because that mutual dependence of all truths is discovered, which, while it links them one to another, throws light on one by another.' Alas, the history of opinion is, in one of its most extensive branches, the history of error. The senses are the single source of our ideas, and furnish its models to the imagination. Hence that nearly incorrigible disposition to judge what we are ignorant of by what we know; hence those deceptive analogies to which the primitive rudeness of men surrenders itself. '_As they watched nature, as their eyes wandered to the surface of a profound ocean, instead of the far-off bed hidden under the waters, they saw nothing but their own likeness._ Every object in nature had its god, and this god formed after the pattern of men, had men's attributes and men's vices.'[41] Here, in anthropomorphism, or the transfer of human quality to things not human, and the invention of spiritual existences to be the recipients of this quality, Turgot justly touched the root of most of the wrong thinking that has been as a manacle to science. [Footnote 41: P. 601.] His admiration for those epochs in which new truths were most successfully discovered, and old fallacies most signally routed, did not prevent Turgot from appreciating the ages of criticism and their services to knowledge. He does full justice to Alexandria, not only for its astronomy and geometry, but for that peculiar studiousness 'which exercises itself less on things than on books; whose strength lies less in producing and discoverin
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