der that attracted this weight to obviate <lb/>
a <emph type="italics"/>Vacuum,<emph.end type="italics"/> will &longs;carce be &longs;atisfactory; un<lb/>
le&longs;s it can be cleerly made out by what li<lb/>
tle hooks, or other grappling In&longs;truments, <lb/>
the internal Air could take hold of the <lb/>
Sucker; how &longs;o litle of it obtain'd the <lb/>
force to lift up &longs;o great a weight; and why <lb/>
al&longs;o, upon the letting in of a litle more <lb/>
Air into one of our evacuated Ve&longs;<lb/>
&longs;els, the attraction is, in&longs;tead of being <lb/>
&longs;trengthen'd, much weaken'd, though, <lb/>
if there were danger of a <emph type="italics"/>Vacuum<emph.end type="italics"/> be<lb/>
fore, it would remain, notwith&longs;tanding <lb/>
this ingre&longs;s of a little Air. </s> <s>For that &longs;till <lb/>
there remain'd in the capacity of the ex<lb/>
hau&longs;ted Cylinder &longs;tore of little rooms, <lb/>
or &longs;paces empty or devoid of Air, may <lb/>
appear by the great violence wherewith <lb/>
the air ru&longs;hes in, if any way be open'd to it. <lb/>
</s> <s>And that 'tis not &longs;o much the decrement <lb/>
of the <emph type="italics"/>Vacuum<emph.end type="italics"/> within the cavity of the <lb/>
ve&longs;&longs;el that debilitates the attraction, as the <lb/>
&longs;pring of the included air (who&longs;e pre&longs;ence <lb/>
makes the decrement) that does it by <lb/>
re&longs;i&longs;ting the pre&longs;&longs;ure of the external Air, <lb/>
&longs;eems probable, partly from the Di&longs;abi<lb/>
lity of vacuities, whether greater or le&longs;&longs;er, <lb/>
to re&longs;i&longs;t the pre&longs;&longs;ure of the Air; and part<lb/>
ly by &longs;ome of the <emph type="italics"/>Phænomena<emph.end type="italics"/> of our Ex-