Things are given, it is eafy to find a fourth 
by the fiime Tube, if the Scale be exadlly 
divided into more or fewer equal Parts of 
Inch. Thus i . Take the Degree of natu- 
ral Heat of a healthy temperate Man’s 
Body, aged about thirty Years, in Bed in 
a Morning, after the Night’s good natural 
Reft. 2. The Cold of any perennial Spring 
which fmoaks in a hard Froft. 3. The 
Degree of Cold, of Snow and Salt mixed, 
ex. gr. in the excefiive Cold and Froft of 
Dec . 21, 22, 23, 24, &c. of 1739, I took 
a new Thermometer, put a Sliding-pipe of 
Silver on it, full of Holes on both Sides, 
to fee the Afcent, Defcent, and Refting of 
the Spirits through. Each Inch of this 
Pipe was divided into twenty equal Parts, 
and tried the Degrees of Cold as below. I 
ufed alfo this Thermometer on its own 
wooden Frame, each Inch whereof was 
exactly divided into eight Parts 5 and the 
Spirits ftood thus on both. 
In the Silver Tube. On the Board. 
The Heat of a healthy Body, 275 — no 
Set in a perennial Spring, 158 — 62 
Deer . 26, in a calm, clear, i 
open, ftrong Froft Air, 3 
55 
Deer . 
