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# Title: [Lectiones XVIII, Cantabrigiae in Scholis publicis habitae] Lectiones XVIII, Cantabrigiæ in Scholis publicis habitæ (shelfmarks Leibn. Marg. 0; ZEN Leibn. Marg. 0)
# Folio 111, page id 797435492:0179
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I. D Unctorum ex inftectione determinaris apparentibus locis, Con
lquielcere possem; liquidem exinde masnicudinum apparentix
deducuntur, quocliber in ipsis existentium punctorum imagines de-
lignando. Cxererumne justo parcius in hac parre, vel illiberaliurs esisse
videar, etiam de rectarum lincarum (consequemer es planarum (uver-
ficierum, quibus distincte visui repraesentandis natura praecipue con (u-
luisse viderur) apparentiis es imaeinibus expressiora specimina quaedam
hand cravabor adnectore. de quibus etiam circa reliquarum magnicu-
dinum apparentias propius ac promprius tiat judicium.
II. NToretur autem imprimis; Sicuti C quod saepius in antedictis.
habetur inlinuatum) cujusque puncti quodammodo duplex est imago;
una simplex, absolura, principalis; illa scilicet, quae in recta verlatur
ad superticiem inAlectentem perpendiculari, perque racians punctum
linul ac oculi centrum transeunre (hoc est in communi lucida radis-
tionis, superticiei retlectentis, ipsusque riionis aXC) altera vero
relata mutabilis, ac minus praecipua; quae calis est respectu ocli
extra rectam insectenti superficiei perpendicularem arbirrarie consti-
curi; ita pari ferme modo duplex cujusque magnicudinis imago con-
cipi potest; una quidem absoluta (quam Paltem hoc nomine desis-
nabo) qux ex punctorum lingulorum in ipsa exictencium absolutis
imaginibus qualiconssatur, illas lalrem comprehendie (qualis in ob-
jecta congrua superticie vivide deformaretur; qualisque videretur
oculo ad infinitam ab inflectente superticie dictantiam rire collocato)
altera vero relata, quae Oculum respicit ubiris in cerra polirione con-
Cticuium; quid relim, ec quare sic distinguam ab exemplis bene mul-
tis in decurlu proponendis luculenter apparebit.
IIL. Super-