( T44<^ ) 
hath ever happened foce the invention of the Barofcope, and 
that was the defcent on Feb, 3d and 4ch laft : Concerning 
which, Mr Townely in a former Letter gives me this account, 
" That on Feb- jd the 5 was at 5 in the Morning at 29. 1 5. 
at3. h. 28. 50. and at 10 at Night at 27. 5. The next day 
" it fell yet lower, and about 12 waa at the lowed, viz. 
" 27. 39. but for an hour before and as much afcer,it varied 
" only fo much as to make it fenfible that it was fallen and 
" beg^n to rife again 5 the loweft he had ever feet) it before 
" was on Nov, 18. 1674. when it fell to 27. 63. That Mr 
FUmJieed at the Obfervatory obferv'd as remarkable a di- 
" fcent of his 5 ^ and that it happened about the fame time 
" of the day, 2 of the Clock in the Afternoon at both 
" places. 
And laftly he tells me, " That the defcent in Feb. laft 
was the greateft that has been fince the filling his Tube, 
" which was in Mcirch 1665. The particulars which I ob- 
ferv'd here at Upmijfjter dhoxxt that defcent were, That on 
BeLi2 the 5 was high, viz. 29. 80, the next Morning 29. 
5©, at Noon 29. 16, at Night 28. 43, the next Morning 
(viz. Feb. 4.) at 7 of the Clock it was fallen to 28. 5, and 
was globofe, as if it had rifen or was inclined to rife 5 But 
it continud in the fame ftation till after Noon, and then 
began to rife about 2 of the Clock, and rofe haftily. The 
Weather accompanying was fair on Feb. 3d in the Morn- 
ing, Hazy at Noon, and Rain at Night, and a violent Tem- 
pcft in the Nighty and all the next Morning, of Feb. ^th. " 
Thus, Sir, I have giveh you the trouble of a long Letter, 
but with no other defign than to (hew you my refpefts and 
gratitude. If you think anything in it worth tt^' cogni- 
zance of the Rojal Society, you may communicate it if you 
pleafe. However,! defireyou to do me the favour to (hew 
'it to Dr Sloane^ becaufe I proraifed him what MrTarMly 
v/rote, in which you will oblige me to add to the obligati- 
ons of 
r 
