Opticks 1717 - Up

1
And hence we may undcrflnnd that Bodies
are mr~cb more rare and porous than is conld
anonly believed. Water is l~inctecn times light2
er , an.d by confecpcnce ninctccn times rarer
than Gold, and Gold is fo rare as very readily
and without the leafi o pofition to t,ranfmit the
xnagneticli: Effluvia, an x eafily tq admit Cjuick-.
iilver into its Pores, and to let W atcr pafs
through it. For a concave Sphere of Gold filled
with Water, and fodcr’d up, IMS LIPOQ pT~
fing the Sphere wit11 great force, let the Water’
fqueeze through it, and Sbrd all over its out’-.
fide in multitudes of fmall. I.II+o~s, like Dew;,
withoc~t burSting or cracl;ing tlic B0d.y of the
Gold as I have been inforln’d by all .hi’.ye Witncfs.
From all which we may conclude I that
-C$old has more Pores than folid parts, and by
confc uence that Water has above forty times
more 9 :)orcs that Parts. And he that Ihall find
out an Hypothefis $! by which Water may be fi
rare9 and yet not be cnpablc of cnmprefTion b
force:, may doubtlefi by the filnlc Hypothe iy 1s
make Gold and Water, and all. other I3odics’as
much rarer as lie pleafes, Ib that Light may
find a ready paD:rgc through trnnfparcnt Sub
itances,
Thdklagm a&s upon h-on through all dcnfe
Bodies not magneticl; nor red hot, without a-
‘,x~y diminution of its virtue ; as for init-atice,,
through Gold, Sil.ver , Lead , Glafs, Water,
‘I&! ~lXVitiIt:i~l~ POWCC Of the SUll 3’s tranfmitted
through the wit I3o&ir~s (2’ the P1ancts with-;
out any diniinutiou, fo a:; to akt up9n all their
parts to their very centers wi.th the fume Force
a1d