&longs;elf, does le&longs;s potently pre&longs;s upon the &longs;ub<lb/>
jacent Mercury. </s></p>

<p type="main"> <s>And &longs;ince we are fallen upon the con&longs;i<lb/>
deration of the Altitude of the Mercurial <lb/>
Cylinder, I mu&longs;t not conceal from Your <lb/>
Lord&longs;hip an Experiment relating thereun<lb/>
to, which perhaps will &longs;et both You and <lb/>
many of your Friends the <emph type="italics"/>Virtuo&longs;i<emph.end type="italics"/> a think<lb/>
ing; and, by di&longs;clo&longs;ing &longs;ome things a<lb/>
bout the Air or Atmo&longs;phere that have <lb/>
&longs;carce hitherto been taken notice of, may <lb/>
afford you &longs;ome hints conducive to a fur<lb/>
ther di&longs;covery of the &longs;ubject of this E<lb/>
pi&longs;tle. </s></p>

<p type="main"> <s>WE took a Gla&longs;s Tube, which, <lb/>
<arrow.to.target n="marg20"/><lb/>
though it were not much above <lb/>
three Foot long, we made choice of be<lb/>
cau&longs;e it was of a more then ordinarily <lb/>
even thickne&longs;s. </s> <s>This we fill'd with Mer<lb/>
cury, though not with as much care as we <lb/>
could, yet with &longs;omewhat more then is <lb/>
wont to be u&longs;ed in making the <emph type="italics"/>Torricellian<emph.end type="italics"/><lb/>
Experiment. </s> <s>Then, having according to <lb/>
the manner inverted the Tube, and open'd <lb/>
the mouth of it beneath the &longs;urface of <lb/>
&longs;ome other Quick-&longs;ilver, that in the Tube <lb/>
fell down to the wonted heigth, leaving,