(iii8) 
( wh'ch is the things for which I mention it) the Noife npon 
thefe It nocks was not fuch a duU noife, as Quick-filvcr or 
other Liquids ufe to make in the open Air, by daftiing a- 
gainft Gi fsor Ice , or other fuch hard Bodies j but fuch a . 
hard fmart noife, as hard Metals ufe to make by knocking 
one againft the other; or, ns if this Ice had been fo knocked 
by a folid piece of Iron or other Metal of fach a bignefs. 
Which difference of noife from what would have been in the 
open Air (where the intern^iediate air mufl firft ha^e been 
beat away, before the Quict^.fiLver could ftrike the Ice, and 
thereby the ftroke of the liquid body obtunded or broken , ) 
I attribute to that voidnefs of Air, which was between the 
Ice an i the diflaac Quick-lilver. And I remeTibrcd pre^ 
fently, that the Honourable Mr. Bojle had formerly (hew'd 
me an Experiment ^ very like this, upon another occafion : 
which made me the readier to take notice of this 5 and I 
did it feveral dayes fucceflive^y. But when, by applying 
the heat of a Candle to the fide of the Glafs , I had melt- 
ed this Ice, I found (as I expeded) that within a little time 
the Quick-filver v/as rifen about a fixteenth part of- an Inch 
above what it was before > which the freezing of the Water 
had till then hindred it from doing. 
My Thermofcope , or Sealed Weather-glafs , ( which , ha- 
ving no communication with the Open Air, and fo not being 
affeded with its Weight, gives accompt but of its Heat and 
Cold;) hath,, thislafl: Froft, been much lower than I ever 
have known it^upon /fi/^ years conftant Obfervation. Which pro- 
ceedeth partly from the Extremity of the Cold, more than 
ordinary and partly from the inclofed Liquor ( being 
Spirit of Wine , tinged with Gochineal ^xoWm^hk fpiritu^ 
ous. 
It was fii ft made in Decemb, i <^<^4. In the Months oijanuaryy 
and of February following , we had very fmart frofts ^ more 
cold than ordinary when yet the loweft mark , to which the li- 
quor did fubfide ( in very hard frofts , and very cold w^nd , j was 
at inches ( at which time, 14' was froft certain, andfome- 
tiraes at ij :nd at 15; .-OThehgUift Summer follow ng,i6^5, 
v/as ufually at ^o^zi .zz^pr. thereabout) but in fome few very^hot 
