C 786 1 
becaufe t did not obrerve,that the Remains of the fame tinged 
jicalij which I kept in another Glafs , nor a portion of the 
fame Oil , which I had alfo by roe in a feparate Vial, did 
cither of them afford fo vivid a Rtfleflion from its furface; 
though I- did the lefs woTider at this , becaufe of the great 
difpofKion eo refleft Lighr, which I had formerly theGurio- 
fity to obferve in the forementioned Oilj when 1 joyned ic 
with other Liquors. But, whether this ftrongly Reflefling 
power, taken notice of in our late recited Experiment , P^'o- 
ceeded from fome mixture, as it were y or confufion of fingly 
^saperceived particles in the Phyfical Superficies or Plain, 
where the two Liquors confine ; or, whether fome iiich ^yila- 
teria frkilU^ or a^ihereal Fluid, as Cartefiwmd fonie of the 
Ancients maintained, infinuated.it felf-b€twecn oUr two Li- 
quors, and made the Difterminating furface more fpecular ; or 
whether the jP/'^»^?^^;?^?;^ be rather due to fome other caufe, 
I fliall not now flay to make Inquiry : But to help towards 
It, I fiiall addonthisoccafion , that looking on this Liquor, 
as a body, which, though ic have all the.neceffary Qualities of 
an Oil, does, in regard of its Origin, and foiue properties I 
have found in it, differ from common Chymical Oils, I was 
invited the more to obferve its Ph^mmenA in reference to 
Reflexion, and I found, among other Things, ( not pertinent 
to this place, ) Br/, That the Confining Plain , often men- 
tioned between the tinged Akali and this Liquor, did not 
appear Red it felf , nor communicate that Colour to the 
image of the Flame of a Candle reflefled from it^ 
Secmdljy that when I warily fhook the Vial, which con- 
tained the two Liquors 3 the uppermoft would be reduced 
into a Teeming Froth, confifting of a great number of imper- 
fefily Globular bodies, which after a while would make a 
kind of a rude Phyfical Plains which, though neither very 
Horizontal nor fenfibly fmooth, would, at its upper fuper- 
^(f/V/, fend back the incident Light with more brisknefs than 
one wouldexpeft^ and .when the feeming Froth confifted of 
finaller particles^ thefe, when they were of a certain fiz^ , and 
conveniently placed, in reference to the Flame of a Candle 
and the Eye, would, fas more than one Trial informed me,) 
releS the Incident Light fomany waies^ and fo vifibly ^ that 
