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TIXVI. Farther Experiments' on Cold , Made at the Macfarlane 
Qbfervato'ry 'belonging to Glafgow College. In a Letter from 
Patrick Wilfon, M. A to the Rev.LityW Mafkelyrie, D. D. 
F» R. S, and Ajlronomer Royal 
... :j ■> ? .it in ■' hoi 1 .q k ' h j-i 07/ :.-yy;: 
Read May 24, 1781. 
’ ■ 1 ' r t , ■ * 
DEAR S/I R, Giargow College, 
Feb 9 , * 761 . 
S OME days of very cold weather, which we had lately in 
this country, having afforded an opportunity of profecuting 
a little farther the experiments and obfervations begun in the 
courfe of laft year, I now do my.felf the plea fu re of communi- 
cating to you the following particulars, which perhaps may be 
, confidered as not unworthy of notice. 
Thefroft fet in on Sunday the 21ft of January, after a con- 
fiderable fall of fnowon the preceding evening, and about mid- 
night the thermometers were expofed near to the Obfervatory 
in the. rituations mentioned- in my former letter. The follow- 
ing regifter fhews the difference of temperature between the 
fnow and the air, till eight o’clock on Monday morning, to 
which are fubjoined fome fa&s which prove very confonant to 
thofe deferibed in the former paper. 
The fign - prefixed denotes degrees below o. The fign -f 
degrees above o of Fahrenheit’s thermometer. 
Monday 
