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# Title: Qua Continentur De Angulo Contactus & Semicirculi, Disquisitio Geometrica. De Sectionibus Conicis Tractatus. Arithmetica Infinitorum: sive de Curvilineorum quadraturâ, &c. Eclipseos Solaris Observatio (shelfmark Leibn. Marg. 84:2)
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De Sectionibus Conreis.
deon ominino, ratio ulla habita fuerit:) adjunea ad
calcem nora, nec ab ullo (credo) ancchac tentat3 Pa-
raboloideon speculatione.
Acq; hac lunt qua in sequentibus exspecter Lcctor
ginocuudus, brevi quantum porui mechodo tradita, nec
tamen ca proprer obscuricate involula. Idcoq; pro.
lixam, quam nonnulli affectare videntur, numerocx
Lemmacum e Propolitionum scrici, lincaribus ubiq;
demonctrationibus, lac quidem longis nonnunguam
acq inrolutis, comprobatorum, pompam diffusiens;
iplasut plurimum non modo endeous, sed _ anoscEas
(ubi id leri commonitione tanqua in TraNCItu praCtA-
ripollic, nec Propositionis Periem nimis conturbet)
iplis Propositionibus inserui, brevitati simul e perixi
euitati consulens: Demonstrationibus etiam (cadem
de caula) potius ex Arithmetico calculo petiris (A-
rithmecieam speciosam incellige) rem agens, quam li-
mearibus; cum illa nec minus scientiticae sint, Ex magis
perspicuae, sed et simpliciores (unc acqu magis univer.
Tales, nec quilquam est (quod sciam) qui Demonstra
tiones Arichmeticas in Ccometria admittendas negu.
verit; _ quidem (praeterquam ubi de Angulis auc
Inelinationibus asitur, aliore aliquo situlocali, aue
qua immediace hinc dependent,) non video quortum
lincaribus ductibus in demonterando admodum opus
C, cum ea omnia quae ex Rationibus sire Proportio.
nibus ordinandis, altermandis, inrertendis, converten.
dis, componendis, dividendis, addendis, auteren-
dis, _c. dependent, non masis Geometrica sinc quam
Arithmericane dicam pocius pure Arithmetica, quan-
quam (ue Arichmetica omnia) tam rei Geometricx
quam aliis etiam disciplinis Machematieis Capistime
immisceantur.
His Premonitis, rem ipsam aecredior.