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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 53, page id 1677894601:0229
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(B
aqueous globules that constiture Clouas or Mists; and for
the most part spaces void of both eir and W ater, but yet
perhaps not reholly void of au substance, betreeen the parts
of hard Bodies.
The truth oF this is erinced by the tuo precedent
Propostions: For by the second Propohtion there are
many reslexions made br the internal parts oF Bodies,
irtich, by the tirst Propolition, vould not happen it
che parts of thole Bodies vere continued without any
luch interstices betreen them, because reslexions arei
caused onty in superticies, irhich intercede mediums ot.
a differins density By PFOP. I.
But Further, that this discontinuitr ot parts is the
principal cause ofthe opacitr ot Bodies, riil appear by
considerins, that opake substances become transparent.
br Aillins their pores rith anx substance oF equal or al-
most equal densitr rith their parts. Thus Paper dip-
Ded in Water or Oyl, the Oculus mundi Stone Aecp d in
Water, Linnen- cloth oyled or varnithed, and mans other
substances Coaked in such Liguors as rill intimatelr
perrade their litele pores, become by that means more
transparent than othervile; (0, on the contrary, the
most transparent substances may by eracuatine their
Pores, or separatins their parts, be rendred lusticiently
Opake, a5 SalES Or WWet Paper, or the Oculus mundi Stone
by beins dried, Hlorn by beins scraped, Glals by beins
reduced to porrder, or otherrile Haved, lurpen-
tine by being sirred about rith Water till ther mix
impertectis, and Water by beins formed into many
Tmal Bubbles, cither alone in the Form ot FrotH, Or
by Makins it together with Oyl ot Turpentine, or
rich some other convenient Liquor, irich wrhich it will
BDE