Opticks 1717 - Up

j&lys of Light.
s are repelfe$ by
Bodies in both thefe Cafes, without the imIne-:
diatc ContdI Of the Pel-rc&ing or inflzeting ~6~
&ly. It kerns ali‘ to follow frbm the..E’,t-nifiion
Of Eight ; the Ray ii4 l‘ooia as it is Ihalten ac
from ti fhining Body by the vibrating Motion of
the Parts of the Body, ,and gets beyond the
&ach of flttra@ion, being driven away with ex&
ceeding great Velocity; ,For that Force which
is fi3l%ciC!llt to turn it back in Reflexion, ma
be futI-icient to emit it. It feems ah’s to fo I! =
101x7 from the Produ&iou of Air and Vapour;
‘The Particles when ‘they are (haken & fYrom
Bodies by Heat tir Fermentation; f”o loon as
they are beyond the reach of the AttraEtion of
the Body; ,rcccding from it; and ali‘o from one
another wit!1 great Strength; and Iceejkig at a
khitance; l’o as fometimes to take up above a
kiillion of times mark lipace than: they did be:
fore in the fo’rrn of a d.cni’e Body; Which vail ,
ContraCtion aud I!:xparifion feems iiriintclligibl~;
by feigning the Particles of Air to be fpringy
and ramous; or rolled LIP like Hdoys; or b aq
other nmw than a rq5uliive ‘Poker; r H he
rticles of ‘Fluids which do not cqhere i.00'
flrongly, and are of filch fi fmallnefs as renders
tllelll mo;lt fufceptible of thdce Agitations which
lcftrcep Li, ~10~s in i Fluor; are 13200. cafily fepai
rated 311 a rarified into Vapourg and in the Las
ts, rhey are If0Iatiles rarieat;
and eondenfiug with
ch are groKer) aud fo lefs
Fufceptible of Agitationi or cohere by a Brorq$d
B.b 2 c$
2