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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 Conicis.
trus non ita semper eminene ut statim perspiciantur,
e Fortaltis etiam nonnunquam Audio oecultantur.
Non tamen ea methodo toram Coni sectionum do-
etrinam prosequor; sed cousq; laltem procedo don
nec primarias acq; cenciales carum affectiones de
texerim, ut iplarum natura atqs cstenciales characte-
res innoreseant, uc inde religuae deinceps affectiones
calculo deduci postint; (Onod criam in sequencibus
Factum cst.) ACq; hoc quidem praesticum est in pro-
postionibus, sire Sectionibus vixinti primoribus. In-
Tertisinterim obiter nonnullis de Conoidibus e Pyra-
midoidibus (quatenus sine nimia diorectione commo-
de Aeri Pocuits) ex praemistis aliquoc qualt Lemmari-
busnecellariis.
Deinde, sepolitis quae a Cono dependent mensuris,
aliilgi in eorum locum subitituris, quae Coni sectio-
nem ubiq: (sire in Cono, sre exrra Conum,) comi-
TCnEUT; COni-sectiones (vuloo dictas) Cono liberatas
atg; exemptas, absolure (nullo ad C onum respectu
habito) considerandas Pscipio, (toram eractarionem
quasi denovo exortus.) tanquam cotidem lineas (Cve
Sisuras) curras in plano descripeas, quae vel Sectione
Coni, vel etiam aliis modisininitis estiei postent. Nc93
enim Parabola, Ellipss. aue Hyperbola, a Cono secto
masis necestario dependent, quam vel Peripheria vel
eriam Triangulum, (qua quidem e PctoCono, et
aliis mille modis produei pollunt:) Ideoq; simplicius
atq universalius eradi e Dostune ex debene.
Denigi, Appendicis loco, Specimen exhibere libu-
se ampliandx Currarum doctrince; (heut ex, in pro-
rrectu, Conoideon e Prramidoideon, tam crectorum
quam scalenorum, quod eamem nemo, quod sciam
anrea fecerat, doctrinam atrigeram; cum antea Co-
noideon non nili rectorum, nec quidem Prramidoi
decor