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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 T IO
metarum prorsus regularis nullam ipsos resistentiam pari quae vel
minimum sentiri potest; aeque adeo neutiquam in maceriam ul-
tam incursare, cujus aliqua sic vis retistendi, vel proinde cujus ali-
qua sit densicas scu vis Inertiae. Nam resictencia Mediorum ori-
tur vel ab inertia materiae Auidae, vel a defectu lubricitaris. OuX
oritur a defectu lubricitatis, admodum exigua est; ec Pane vix
oblerrari porest in Fluidis vulso nocis, nisi valde cenacia fuerint
adinstar Olei ec Mellis. Relistentia quae senritur in AerC, Aqua,
TIydrarorro, ex hujusmodi Fluidis non tenacibus Fere eota cA
prioris generis; ex minui non porelt per ulceriorem quemcunque
gradum subcilicatis, manence lluidi densitate vel vi inertix, cui
lemper provorcionalis est haec relistentia; quemadmodum claris-
sime demonstratum est ab Auctore notro in pereoresia Relisten-
tiarum Theoria, quae paulo nunc accuracius exponieur, hac lc-
cunda vice, ex per experimenta corporum cadentium plenius
contirmatur.
Corpora progrediendo motum Cuum Eluido ambienti paulatim
communicane, ex communicando amictunt, amittendo autem re-
cardantur. LA itaque recardacio motui communicato proportio.
nalis; motus vero communicatus, ubi datur corporis progredientis
velocitas, est ut Eluidi densitas; eroo retardacio seu relistentia
erie uc eadem Fluidi densitas; neque ullo pacto tolli porest, nisi
a Fluido ad partes corporis polticas recurrente restituatur motus
amissus. Hloc autem dici non pocerie, nisi impresso Eluidi in Cor-
Dus ad partes polticas aequalis fuerie impressioni corporis in Flui-
dum ad partes anticas, hoc eAt, nisi velocitas relacira qua tlui-
dum irruit in corpus a tergo, aequalis fuerie velocitati qua cor-
pus irruit in Fluidum, id cst, nili velocitas absolura Fluidi re-
currentis duplo major fuerit quam relocitas absoluta Fluidi pro-
puls; quod heri nequie. Nullo isitur modo tolli porest Flui-
dorum reliltentia, quae oritur ab corundem densitate ec vi in-
ertixe. Leaque concludendum erit; Eluidi caelectis nullam ene
vim inertix, cum nulla sic vis resictendi: nullam esse vim qua
motus communicetur, cum nulla sic vis inerrix: nullam esse vim
qua mutacio quaelibet vel corporibus sinsulis vel pluribus indu-
CatuT, cum nulla sIC vis qua motus communicetur: nullam este
omnino efficaciam, cum nulla sic Facultas mutationem quamlibet
inducendi. Ouidni ergo hanc HIypochesin, quae Fundamento
plane desticuitur, quae que naturae rerum explicandae ne minimum
quidem inserrie inepeissimam rocare liceat ex Philo(opho PrOr-
si