( i. 24 ) 
made and regulated by an Inftrument* Maker of the 
Royal Society, in order to compare the Obferva- 
tions to be made in Germany , by the Means of 
thofe Thermometers, with the Obfervations made 
in England by the like Thermometers, the one be- 
ing regulated by the others. M. Weidler , ProfefTbr 
of Mathematicks at IVittenberg , mentions in the 
Account which he gave of his Meteorological Ob- 
fervations for the Year 1729, that he hasfurnifhed 
himfelf with one, which he intends to make ufe of 
hereafter for his Meteorological Obfervations. He 
alfo fays, that the Obfervers of the Royal Society 
of Berlin, make ufe of a like Thermometer; and I 
have myfelf received from thence, Obfervati- 
ons on the Heights of the Thermometer of Spirit 
of Wine, made probably with that Inftrument, for 
the whole Year 1729, and forthe firft three Months 
of 1 73 1 . Thofe Obfervations are engraved on Cop- 
per Plates, where the Heights of the Spirit of Wine 
are expreffed in Parts of the Fre?ich , Englijh , and 
Rhinland Foot. If the Royal Society approve of 
this Sort of Thermometers, and are defirous I 
fhould compare them with mine ; if they alfo defire 
that Meteorological Obfervations with thofe Ther- 
mometers of Spirit of Wine fhould be made in 
RnJJia , I beg you would fend me feveral of them ; 
but then I beg that thole you fend me, be well 
regulated, and exaftly compared with thofe the Ob- 
fervers of the Royal Society make ufe of ; fuppofing 
that lbme Perfon or other of their Body is ap- 
pointed to keep Journals of thefe Obfervations. I 
ihall fend in exchange to the Royal Society, if they 
defire it,fome Thermometers of Mercury regulated 
b y 
