[[ 26 il] 
abovc-mcntion’d was induced to think, that a Man 
could not bear, without the utmoft Danger, a greater 
Heat than that which would raife the Mercury to 90 
in Fahrenheit ’ sj but an ingenious and accurate Cor- 
refpondent of our Authors at Ajlrachan informs 
him, that it not only rifes there to this Degree fre- 
quently, but even to 100, and he has fee n it 103F. 
Even in the Bagnio's in Rnjjia , the Heat is often 
equal to 100: It fometimes makes the Quickfilver 
afeend to 108, 10, and to 116, as may be tried 
every Day ; and yet People not only bear them with 
Impunity a few Minutes, but often ftay half an 
Hour or an Hour. 
One necefiary Obfervation our Author makes, 
which is, that the Ball or Tube containing the Mer- 
cury ought to be as dry as poflible on the Outfide, 
during thefe or any other Trials with the Thermo- 
meter : For the adhering Moifture, by forming a 
cooler Atmofphere around it, has fometimes occa- 
fion’d a Difference of 10 Degrees. 
Thefe are fome principal Fads given us by our 
Author in his Preface, relative to the Natural HiR 
tory of Sibiria in general: What follows chiefly 
regards the Work it is prefixed to. 
As a juft Idea of this Part cannot be exhibited 
in a narrow Compafs, the Curious in this Branch 
of Science muft be referred to the Book itfelf. 
1 have only to acknowledge with Gratitude the 
Inftrudion and Entertainment I have received from 
this elaborate Work : It is a Tribute juftly due to 
the learned and ingenious Author, in Return for 
the Pains he has taken, and the Fatigue he has en- 
dured in this inhofpitable Region j and to intreat 
L 1 2 vour 
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