Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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PHYSICES ELEMENTA
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quibus retina conſtat, agitantur; </
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ctorum, in oculo depictorum, in mente excitantur. </
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<
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ter ideas & </
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<
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">motus quibus excitantur, ut ante dictum ,
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latet: </
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">in cauſis ſenſationum determinandis, non ultra ner-
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vorum agitationes penetrare poſiumus.</
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<
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">Quo pictura memorat a magis eſt exacta, quo objecta diſtin-
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ctius apparent. </
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<
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">Quando radii ab eodem puncto manantes
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non exactè in retinâ junguntur, illius pictura non eſt pun-
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ctum ſed macula, quæ confunditur cum picturis punctorum
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vicinorum; </
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<
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">in quo caſu viſio confuſa eſt.</
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">Cùm autem, pro varíâ puncti radiantis diſtantiâ, hujus
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focus magis aut minus removeatur , neceſſe eſt, ut
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detur in oculo, ne locus in quo pictura eſt exacta, ante aut
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poſt retinam cadat, & </
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<
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">Quænam autem hæc ſit mutatio difficulter admodum de-
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terminatur, variæque dantur Philoſophorum ſententiæ; </
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ca quas in genere notabo, minimè probabile eſſe totius oculi
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figuram mutari, ad removendam aut admovendam retinam,
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& </
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<
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xml:space
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">Nam ſi figura oculi mutaretur, cùm in omnibus Animali-
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bus æquè neceſſaria ſit mutatio de qua agitur, in omnibus
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animalibus oculi figura eaſdem ſubibit mutationes; </
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<
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enim effectus cauſas varias in rerum natura non deprehen-
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dimus. </
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">In Balenâ verò ſclerotica nimium eſt dura, ut va-
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riationi obnoxia ſit. </
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<
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">Ulterius, ſi talis detur mutatio in toto
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oculo, orietur hæc ex muſculorum externorum preſſione,
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quæ pro variò oculi ſitu diverſa erit, & </
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<
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unico oculi ſitu.</
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<
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">Si nunc oculum in interiori examinemus, mutationem in
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cryſtallino neceſſariò dari patebit; </
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<
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lo, aut mutatione figuræ, deſideratum effectum præſtabit;
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</
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<
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">Radii enim retinam ante concurſum ſecantes, in retinâ con-
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current, ſi convexior fiat cryſtallinus humor , aut ſi,
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vatâ hujus figurâ, ipſe magis verſus anteriorem oculi partem
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feratur.</
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<
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nam accedere & </
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