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~2aa-j -<br />
in thbt of Water ;nd Sal-g& aill great&u;, slid<br />
ill that of Water and (z&Ifs,‘OKryital, or otl1eP<br />
de&r Subfiancqs, itill gre>lter, accordingly is<br />
thofe Medititns, di.Eer mote or lei3: in their rem<br />
f~&i:ingl?owers. Hence k the Confine of corn..<br />
man GM’s md Cryfial, there otght to be g<br />
weak Reflexiall j and a fi~~l~ger Keflexioa in<br />
the COII~%VZ ‘of common and XnetalIilic *$Zlafsjb<br />
though I hme not yet tried this. Biit; in th&<br />
Canfine of two Glailks of eq~d detifiry$ th&g!<br />
is not my knfible Reflexion, ‘as was ihewn id .<br />
the, fir!3 Obfcrvation. A.nd the time 11~~7 l.e,~e<br />
d;lllde&ood of the Superficics interceding twd<br />
~q7fial~, or two Li uors, ,or ally othec Sub:<br />
&$xes in which no 19 iefraCtion is c&ilfed. Sli!<br />
then tile reafon N$y uniform pelliicid Mcdkmis~<br />
.’(fuch as Wntei-, Glafs, or CryitaI) have fiti fen;<br />
ilble Reflexion but in j&il” exterlial Srrp’~?ficies~<br />
where theji q-e adjacent to other Medii~ms of<br />
a diflkrent de&y, ‘is becaufe all their’ co’&,<br />
guous parts have one and the lime degree $<br />
denfity.
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