c 328 ] 
I need not mention upon what principles of the 
heating and cooling of bodies this expedation was 
founded, as they will readily occur of themfeives. 
The fadt was, that I immediately repaired to the 
fields, and fought out a low place, upon which the 
fun had not then rifen ; here I laid the thermometer 
in the fnow, almoft upon the very furface, when pre- 
fently the mercury funk from -|-d deg. to — 2 deg. 
which therefore I concluded to have been pretty 
nearly thecoldeft temperature of the air over night. 
The next thing was, to make regular obfervations 
with the thermometer, fo long as the cold promifed 
to continue remarkable. The inflrument was hung 
upon a pole near to the obfervatory, and to the wind- 
ward of it, care having been alfo taken to keep it 
under a proper fliade, fo long as the fun flione out. 
Regijier of the Thermoyneter^ kept at the M- Far lane obfervatory^ of 
the college of GlafgoWy on funday 'January 3, and monday Janu- 
ary 4, 1768. 
Sunday 10 o’clock -p 5 deg. 
7 
g The temperature of the fn®w 
10 on funday morning, at about ten 
1 1 inches below the furface, was near 
gh to 30 deg. 
H 
si 
2 
li 
— ' I 
— 
morning 1 1 
12 
afternoon i 
2 
3 
si 
4 
4l 
5 
si 
6 
7 
8 — 
