Spring-Tides. </s> <s>For he &longs;agaciou&longs;ly and <lb/>
plau&longs;ibly conjectur'd that &longs;uch ob&longs;ervati<lb/>
ons accurately made, would di&longs;cover the <lb/>
truth or erroneou&longs;ne&longs;s of the <emph type="italics"/>Carte&longs;ian <lb/>
Hypothe&longs;is<emph.end type="italics"/> concerning the Ebbing and <lb/>
Flowing of the Sea: which <emph type="italics"/>Des Cartes<emph.end type="italics"/><lb/>
a&longs;cribes to the greater pre&longs;&longs;ure made upon <lb/>
the Air by the Moon, and the Intercur<lb/>
rent Ethereal Sub&longs;tance at certain times <lb/>
(of the Day, and of the Lunary Moneth) <lb/>
then at others. </s> <s>But in regard we found <lb/>
the Quick-&longs;ilver in the Tube to move up <lb/>
and down &longs;o uncertainly, by rea&longs;on, as it <lb/>
&longs;eems, of accidental mutation in the Air; <lb/>
I &longs;omewhat doubt whether we &longs;hall finde <lb/>
the Altitude of the Quick-&longs;ilver to vary <lb/>
as regularly as the Experiment is ingeni<lb/>
ou&longs;ly propo&longs;'d. </s> <s>The &longs;ucce&longs;s we &longs;hall (God <lb/>
permitting us to make tryal of it) acquaint <lb/>
Your Lord&longs;hip with; and in the mean <lb/>
time take notice, that when we had occa<lb/>
&longs;ion to take the Tube out of the Frame <lb/>
(after it had &longs;taid there part of <emph type="italics"/>November<emph.end type="italics"/><lb/>
and part of <emph type="italics"/>December<emph.end type="italics"/>) a good Fire being <lb/>
then in the room, becau&longs;e it was a Snowy <lb/>
day, we found the Quick-&longs;ilver in the <lb/>
Tube to be above the upper &longs;urface of <lb/>
the &longs;ubjacent Mercury 29 Inches three <lb/>
quarters. </s></p>