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# Title: [Danielis Lipstorpii Lubecensis, Specimina Philosophiae Cartesianae] Danielis Lipstorpii Lubecensis, Specimina Philosophiæ Cartesianæ (shelfmarks Leibn. Marg. 14; ZEN Leibn. Marg. 14)
# Folio 16, page id 746572255:0040
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16
P A R S P R E M A
2s Primum in gencreinrencionis est dioperica immane quan-
cum: ab aliis, quibus autchac uli lumus, discedens, praelertim
quod Nacuram Luminis, Vilionis, _ Retractionis concernii,
quam mirabrerieate de lubrilirace ita exornaric, ut quaecunque
derellexionibus, retractionibus, carerilque rebus ad perte-
etionem rilus pertinentibus incelligi polune, perlecutus (IF, dE
quae de retractionis legibus ance tuerunt deliderata, plane
vertecerit. Oua in re, li lucem rilurae sint iltx crudiex com-
mencationes, quas Subcilissimus Dri. Cudscorius, Loranien-
Sis Machemarum Profelor in cam adornac; haudicio, num
quidamplius in eo genere deliderari possie. IIc aurem lcias
quidin calingularis eenobilioris census, quam ca lunt, quae la-
Etenusin opticistradita lune, contincatur, considera, quaelo,
Conicatum lectionum propriecaces in ea Subrilissime PerEr2-
Ctacas, line quibus refractionis natura, ut e rilus patio pertici
nequit. IIc enim Tubos dioptricos, pretiolissumum nempe
humani ingenii invencum, ee vicra comburentia omittam,
quiddicemus de ritrisin formam FIlipsis, Oralis ec FIyperbo-
les expolitis, qua non tantum eformare docet, sed, quod
maximum est, illorum propricrares oltendit, non rasisracio-
ciniis aur conjecturis suftultas, sed Armissimis demonstrario-
nibus Machematicis lubnixas, quas in Gicometria FuLIUS Per-
sequitur. Ilam quod Oralium proprictares concernie, quo
pactoiniis Rehexiones tiant _R eFractiones, dOcCrGCOMCTE.
l. 2. P. 11I. 62. 63. Leq. ubi eximiam inter alia obserrarionem nc-
retur, quod radiis in superticiem concaram speculi inciden-
ribus (caeterisparibus, iilque politis quae ibidem habentur) re-
Rexionum angulinon lecus ac retractionum inaequales exi-
Stant, atque eodem modomenturari postine. Fcp. 67. de lcg.
ubi ostendic. Duomodo ritrum heri posse, cujus una lupert-
ciestam conrexa, ant concara siE, quam libuerit, quodradios
omnes, qui ex uno daro punctoprodcune, colligarrurtusin
alcero daro puncco; ex quomodo iltiulmodi vitra majorem
vim