A Short Treatise Upon Arts and Sciences; In French and English, by Question and Answer ...

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General Books, Mar 6, 2012 - 72 pages
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1792 Excerpt: ...fcuTSv v-..-.'1 H 4by qu'il s'est trouv ert Hollande un organiste, qui, quoiqu'aveugle, jugeoit fort bien, malgr le proverbe, 'd Botes fortes de couleurs. L'orgnniste aveugle jouoit me aux cartes & gagnoit souvent, sur-tout quand c'etoit lui faire. A T Oft s. EuclMe, Aristote, Platon, Alhaten, Henri Van Etten, le Chev. Newton, &c. Ce dernier a surpaff dans l'optique tous les philosophes qui ont te avant lui. y. D ranged, art not really upon the surface of the wall. If it was so, it would cost little to adorn an apartment. Colours, such as we perceive them, as well as founds, such as we hear them, are nothing else, properly speaking, but modifications of our foul. But these modifications are produced by the impression of imperceptible matter, which strikes the organ of sight; and, to this matter, which is so disposed as to be capable of producing them, is given the name of colours. In a word, the reason why bodies appear differently coloured, is because the figure of their pores, and the texture and consistence of their parts, reflect more rays of one kind, while they transmit the greatest part of the others, or absorb them. History places upon a mountain in China., a statue, that marks out the different changes of the weather, by the alteration of colours that happen to it. Probably the air, according as it is moist, or dry, changes the texture of the small parts which compose the surface of the statue. The texture being changed, reflects the rays after another manner. Hence those changes of colours, which are a sort of a weather-glass. Some persons have discovered coloured objects, without the help of eyes. They talk of a blind sculptor, who distinguis...

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