[ 2 ^° ] 
Such an Excefs of Cold could fcarcely have been 
fuppofed to exift, had not Experiments, made with 
the greateft Exafrnefs, demonflrated the Reality of it. 
During this extreme Frofl at Jenifea , the Magpies 
and Sparrows dropp’d down as they flew, and to 
all Appearance dead ; tho’ they mod recover’d 
when brought into a warm Room. This was quite 
new to the Inhabitants of that Country ; tho’ it 
frequently happens in Germany in much lefs intenfe 
Cold, when the Weather fets in at once very ie- 
vere. 
The Air, fays our Author, was at that time ex- 
tremely unpleafant ; it feemed as if itfelf was froze, 
being dark and hazy ; and it was fcarce poflible 
even to bear the Cold in the Door- Way for three 
or four Minutes. 
Thefe Experiments, our Author allures us, were 
made with all poflible Exaftnefs, and agree with 
many others, made in different Parts of Sibiria by 
his Direction 5 and from thefe we may conclude 
that the Cold in Sibiria is more intenfe than it has 
yet been found to be in any other Part of the 
World. 
_ It was not apprehended that a greater Degree of 
Cold exifted any-where, than that artificial one pro- 
duced by Boerhaave , by means of concentrated Spi- 
rit of Nitre, which funk the Mercury 40 Degrees 
below o. in Fahrenheit's ; which was fuppofed. to 
be the Point beyond which no Animal could bear it. 
But the utmoft Limits of Cold arc yet unknowns 
or to what Degree an Animal can fubfift in it, 
when inured to it by little and little. The Hiflory 
of Heat is alike imperfetf. The celebrated Profeffor 
’ above- 
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