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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)
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Fpistola; in qua Operis hujus Argumenium, C
quaedam Theoremata deriro, partim ab aliis agnita (quae
methodi gratiâ, Ex propter aliorum probationem, meis de-
monstrationibus Armata appono) partim a meoblervata.
deinad specialia progredior, id mihi negocii lumens, ut
Catoptricae, ac Dioptricae utriusque, in ulu maxime polita
(Planae Scilicet d Sphaericae) pociltima pertractem
Tn
Catoptrica Sphaerica (Aguidem plana jam olim vere latis–
ac Fuse exculta habetur) ejulmodi Theoremata proponO
de quibus reflexorum radiorum interlectiones atque limi-
tes innotelcunt; unaque punctorum tam a longe, quam e
propinquo radiantium imagines, es apparentes loci deter-
minantur; respectu oculi nedum in racliationis axc, sed
extra ipsum ubicunque constituti. Quae certe vel nusquam
Quod sciam) aut magna ex parte perperam alibi cractata
prostant; id quod, incidenter aliorum retutans sententias,
cum ratiociniis perspicuis, tum experimentis decretoriis
evictum co. Dioptricam porro tam planam qu’am Sphae
ricam, retractionis novissima praestrata lese vel lypothesi
Quam illustris Cartesius detexit, at plerique, reor, melio-
res optici jam amplexantur; quam ee propter altignatas
alicubi rationes veritati consonam judico) velut a funda-
mentis extruo. nec enim eorum, qui principium illud ad.
miserune, ipsum hactenus quisquam (in scriptis intelliso
quae viderim luci commendatis) huc applicuie. Hic au-
tem imprimis puncta radiantia longe dissita (seu quati
Parallelos emittentia radios) considerans, quo pacto ab
iplis produentes radii detorquentur exquiro, Theoremata
quaedam eliciens, e quibus praecipua refractorum simpto-
mata liguent, iplorum interlectiones ac limites disnoscun
tur; apparentia denique punctorum objectorum loca de
sienantur, tam oculi respectu qui in axc, quam ejus qui
ulpiam extra axem collocatur. tunc eadem actento quond
puneta sensibiliter vicina, seu divergentibus radiis allu-
centia. sub extremum, quo paratior sic horum. uluS,
punctorum