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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 67, page id 1677894601:0243
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=243
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another, there is no sensible reflexion as ras declared
in the tirst Obserration; and vet I sce no realon why
the rass Mould noc impinse on the parts oF CrtaIS a5
much irhen contisuous to other Crlals a5 Wrhen con-
tiguous to Air. Fisthly, When the top ot a Water-
bubble (in the 17th Obserration) by the continual (ub-
lidins and exhralins of the Water orem very thin, there
ras such a lictle and almost insensible quantitr ot Light
retlected trom it, that it appeared intenls black; Wrhere-
as round about that black Spot, Wrhere the Water Was
thicker, the reflexion iras lo Arons a5 to make the
Nater Icem very wrhite. Nor is it ouly at the lcast
chickness of thin Plates or Bubbles, that there iS, nO
manisest reflexion, but at mans other thickneses con-
tinualls greater and greater. For in the 15th Obler-
ration the rays oE the lame Colour vere by turns trans-
mitted at one thieknels, and reflected at another thick-
nels, For an indeterminate number ot luccesions. And
vet in the superticies ot the thinned Bod), Wrhere IE 15
oF any one thickness, there are a5 ManY PaFIS FOF FhC
rayS Eo impinse on, 25 irhere it is oF any other thick-
nels. Sixthly, IF reflexion ivere caused by the parts ot
retlectins Bodies, it rould be impossible for thin Plates
Or Bubbles at the lame place to refleet the rays ot one
Colour and transinit thole of another, a5 ther do accor-
dins to the 13th and Esth OblerVatIONS. FOT it 1S
not to be imasined that at one place the rays whieh
For instance exhibit a blue Colour, ould hare thefor-
tune to dastr upon the parts, and thole irhich extibit
a red to hit upon the pores oF the Body; and then at
another place, irhere the Body is cither a litelethicker,
Or a little thinner, that on the contrary the blue Mould
E K 2
tri