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Heat was probably i 24 or 1 2 6 Degrees, as the fhaded 
Air’s Heat was then 98) dropp’d iuddenly dead; and 
feveral Slaves in the Country, at Work in the Rtee- 
Fields, (bared the fame Fate. I faw one of the 
Men immediately after he died; his Face, Neck, 
x- Bread, and Hands, were livid. 
From the barometrical Table it appear?, that the 
Barometer’s mean Altitude, taken from its greateft: 
-and kaft Height, is 30 09 Inches; and that i s Raige 
is only 1.22 Inch. Wherefore our Atmofphere va- 
ries only yj Part in its W eight. In the warm 
Months, the mean barometrical Station, taken from 
its greateft and leaft Altitudes in thefe Months, is 
30.09 Inches; and I have never yet feen its Range 
in thefe Months exceed Parts of an Inch : There- 
fore the Changes of our Atmofphere’s Weight, in 
the warm Months, will have but little EffeCt upon 
human Conftitutions, s as the Difference between its 
greateft and leaft Preffure is but \ Part of that in 
coid Climates, where the Range of the Barometer 
is three Inches. May not the great Height of the 
Barometer in the warm Months in this Climate, 
proceed from the vaft Quantity of Water, which is 
at that time fupported in our Atmofphere, as the 
Exhalation is then very great ; or may it not pro- 
ceed from the Rarefaction of the Mercury > For the 
Weight of the mercurial Column, at equal Alti- 
tudes, will be different under different Degrees of 
Heat ; and the Mercury may therefore be fupported 
at equal Heights by Columns of Air of unequal 
Weights. 
1 
It 
