bubbles, the greater they will grow, be­<lb/> cau&longs;e having the le&longs;s weight and pre&longs;&longs;ure <lb/> upon them, the Expan&longs;ion of that Air <lb/> which makes them, can be the le&longs;s re&longs;i&longs;ted <lb/> by the pre&longs;&longs;ure of the incumbent Water <lb/> and Air; as &longs;eems probable from hence, <lb/> that upon the letting in a little external <lb/> Air, tho&longs;e bubbles immediately &longs;hrink. </s></p>
<p type="main">
<s>It may indeed, as we lately intimated, <lb/> be conjectur'd, that the&longs;e bubbles pro­<lb/> ceed not &longs;o much from any Air pre-exi­<lb/> &longs;tent in the Water, and lurking in the <lb/> Pores of it, as from the more &longs;ubtle parts <lb/> of the Water it &longs;elf; which by the expan­<lb/> &longs;ion allow'd them upon the dimini&longs;h'd <lb/> pre&longs;&longs;ure of the ambient Bodies may gene­<lb/> rate &longs;uch bubbles. </s>
<s>And indeed, I am not <lb/> yet &longs;o well &longs;atisfied that bubbles may not <lb/> (at lea&longs;t &longs;ometimes) have &longs;uch an Origina­<lb/> tion: but that which makes me &longs;u&longs;pect <lb/> that tho&longs;e in our tryals contain'd real Air <lb/> formerly latitant in the Pores of the Wa­<lb/> ter, is this, That upon the inletting of <lb/> the external Air, the Water was not <lb/> again impell'd to the very top of the <lb/> Tube whence it began to fall, but was <lb/> &longs;topt in its a&longs;cent near an Inch beneath <lb/> the top. </s>
<s>And &longs;ince, if the upper part of <lb/> the Tube had been devoyd of any other
