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# Title: [Philosophiae Naturalis Principia Mathematica] Philosophiæ Naturalis Principia Mathematica (shelfmark Leibn. Marg. 166)
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P R A F A TIO
sune summe regulares, ee peraguntur in Sectionibus Conicis, nunc
valde cccentricis, nune ad Circulorum proxime tormam acceden-
cibus; jure quaerendum erit, qui hieri possir, ut iidem integri con-
serventur, nec ab actionibus maceriae occursantis per tor sxcula
quiequam perturbentur. Sane s motus hi Acticii sunc magis com-
Dosici ec difficilius explicantur, quam veri illi mocus Planetarum
et Cometarum; Frustra mihi videntur in Philosophiam recipi:
omnis enim Causa debet ene F Rectu suo simplicior. Concesa
tabularum licentia, affirmaverit aliquis Planetas omnes ec Cometas
circumcinsi Armosphaeris, adinctar Telluris nostrae; quae quidem
Hypochesis rationi magis consentanca videbicur quam Hypoche-
sis Vorricum. Afirmaverit deinde has AemosphaeraS, ex natura
Cua, circa Solem moveri ex Sectiones Conicas describere; qui
sane mocus multo facilius concipi pocest, quam consimilis motus
Vorticum se invicem permeancium. Denique Planetas iptos de
Cometas cirea Solem deterri ab Atmospheris suis credendum esse
AAEUAE ex ob repertas mocuum exlestium causas trium phum a92C.
Duisquis autem hanc Fabulam rejiciendam esse puret, idem et alte-
ram Fabulam rejiciet: nam orum non est oro limilius, quam IIy
Pothelis Atmosphaerarum LIypocheh Vorticum.
Docuit Calilaens, lapidis projecti et in Parabola moti dellexio-
nem a cursu rectilineo oriri a GTravicate lapidis in Terram, 2b oc-
culca scilicet qualitare. Pieri tamen porest ue alius aliquis, nasi
acurioris, Philosophus causam aliam comminiscatur. Finget igi-
cur ille materiam quandam subcilem, quae nec visu, nec tactus
neque ullo sentu percipitur, rerlari in resionibus quae proxime
contineune Telluris superticiem. Hlanc aurem materiam, in di-
vertas plagas, variis ex plerumque contrariis motibus ferri, se li-
neas Parabolicas describere concendet. Deinde vero lapidis de-
Rexionem pulchre sic expediet, ex rulgi plausum merebitur. L. a
Dis, inquiet, in Fluido illo subeili natat; ex cursui ejus obsequen-
do, non potest non eandem una semitam describere. Lluidum
vero moretur in lineis Parabolicis; ergo lapidem in Parabola
moveri necesse est. Ouis nunc non mirabitur acucistimum hujusce
Philosophi ingenium, ex CansiS Mechanieis, materia scilicet e
motus plixnomena Naturae ad vulsi etiam captum praeclare de
ducentis? Duis vero non sublannabit bonum illum Cralilaum, qui
magno molimine Mathemarico qualitates occultas, c Philosophia
telicirer exclulas, denuo revocare sustinuerit. Sed pudet nugis
diutius immorari.
Dum-