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London [Mr. J. Patrick^'i^ Spirits were four or five 
degrees lower than in 1683. 
In the greateft Contraction of the Spirits was 
on JattHAry 3. which was ah exceffive cold Day at ZJpmin^ 
fler alfo.- But the far greateft Contraction with us was 
on December 30. before. The reafon of the Difference 
is, because my Thermometer is always abroad ih the 
open Air. w here no Sun-fbine toncheth 5 but thofe two 
'London-Qlajfes arc withia Doors, in Rooms where no 
Fires are made. And it is eafie to obferve, that the Froft 
doth not prefently exert its greateft force within Doors •• 
And when it doth, neither doth it fo foon abate its force 
within Doors, as without. The reafon whereof is plain 
enough, and needs not be mention’d. 
Tbefe Obfervatiohs of the Intenfcnefs of the Cold 
with us, I have received Confirmations of from other 
Places in the Southern Parts ot our Ifland ^ particularly 
I find them to agree with fome Obfervations made at 
Streatham in Sarrey by Mr. Crejfener^ an Ingenious Mem- 
ber of our Society. 
I had like to have forgotten to Note, That the 
Defcenr of ihe Spirits in rny Thermometer on December 
wa's within One tenth of an Inch as great as the Defcent 
effected at another time (and that in a cold Day too) 
with A tifiTil Freezings pc form’d both with Snow and 
Salt, and alfo Snow and Spirits, Both which Mixtures I' 
have feveral times made ufe of, and find them nearly of 
equal Power: If any difference be, I have fometimes’ 
thought the preference due to the Mixture of Spirit of 
Wine with the Snow. I faid alfo the Contraction of the 
Spirits in a cold Day, becaufe an Artificial Freezing is 
lefs vigorous in a warm Diy than in a cold one. It is well 
known that we can in Summer freeze witn Ice and Salt, 
and the fame may be then done with Sal Armoniack dif- 
folv’d iu Water but sve cannot produce ib intenfe a Froft 
Y y y 2^ then - 
