Descartes, René
,
Renati Des-Cartes principia philosophiae
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dis, ſed in hoc à ſale communi diverſis, quòd in unâ
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extremitate ſint craſſiores, quàm in aliâ: ut vel ex eo
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patet, quòd aquâ ſolutum, non ut ſal commune, figurâ
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quadratâ in ejus ſuperficie concreſcat, ſed vaſis ſundo
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&slateribus adhaereat.
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CX.
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De nitro. </
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Et quaritum ad magnitudinem particularum, pu
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tandum eſt talem eſſe inter illas proportionem, ut
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eae ſuccorum acrium, quae ſunt in ſulphure, à primo
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elemento commotae, facillimbè globulos ſecundi ex
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intervallis ramulorum materiae oleagineae excutiant,
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ſimulque nitri particulas, quae ipſis ſunt craſſiores,
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exagitent. </
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CXI.
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De ſulphuris & nitri
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conjunctione. </
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Atque hae nitri particulae, quâ parte ſunt craſſiores,
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gravitate ſuâ deorſum tendunt, earumque ideò praeci
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puus motus eſt in parte acutiore, quae ſurſ-Lim erecta,
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ut in B, agitur in gyrum, primo
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exiguum, ut in C; ſed qui (niſi
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quid impediat) ſtatim ſit major,
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ut in D; cùm interim ſulphuris particulae, celerrimè
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verſus omnes partes latae, ad alias nitri
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bre
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viſſimo tempore perveniunt. </
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CXII.
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De motu particularium
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nitri. </
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Et quoniam harum nitri particularum ſingulae mul
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tum spatii exigunt, ad circulos ſui motûs deſcriben
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dos, hinc fit, ut hujus pulveris flamma plurimum di
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latetur; & quia circulos iſtos deſcribunt eà cuſpide,
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quae ſurſum verſus erecta eſt, hinc tota ejus vis tendit
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ad ſuperiora; & cùm valde ſiccus & ſubtilis eſt, in
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noxiè in manu poteſt accendi. </
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CXIII.
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Cur flamma hujus pul
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veris valde dilatetur,
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&spraecipuè agat ver
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ſus ſuperiora. </
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Sulphuri autem & nitro carbo admiſcetur, atque
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ex hac miſturâ, humore aliquo aſperſâ, granula
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pilulae fiunt, quae deinde exſiccantur. </
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<
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