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 NB At Dmitrefsk in the angle which the 
 small rivulet of Kamyshenka forms with 
the Volga, there is plenty of a grey 
Slate, which greedily imbibes the moisture
of the air, & was found by a Prof. Lovitz
to be an excellent counterpoise for making
hygrometical scales.   Mention has
been made of it, from a Letter of Dr.
Guthrie's in the Medical Commentaries
of Edinburgh, & a full description
of Lovitz's hygrometer will be given
in the second volume of Acta Acad.
Petrpolitanae. 
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 Identifier: | JB/539/167/001"JB/" can not be assigned to a declared number type with value 539.  | 
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 1781-03-12  | 
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 539  | 
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 167  | 
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 001  | 
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 Correspondence  | 
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 Peter Simon Pallas  | 
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