( }'« ). 
to compare the Heights found by Obfervation therewith. 
And though Tome fmall Errors, in the Obiervations, do 
make them vary a little from each other, yet in the 
main, they agree as near as poflible with the Numbers 
of tht Table ; as did alfo feveral other Experiments too 
long to mention, which makes me believe thofe Num- 
bers are not far from the Truth ^ but of that you will 
be belt able to judge^ by comparing thefe Experiments 
with others of the fame Kind. 
That the Air is colder, as well as more light andrare, 
in Places that are fituated high, than it is in the Vallies 
and low Grounds, is generally known ^ and in order to 
learn, how much it might be fo, I got a Friend of mine, 
who lives higher than we do here, to obferve the port- 
able Barometer and Thermometer, at his Houfe, for 
fome Days, being plac’d as near as poflible in the fame 
Circumfiances with mine } and we found his Barometer 
hood at a Medium for 20 Days, 3 Tenths lower than 
mine, and the Thermometer 3. deg. 2. lower; allowing 
for the Difference of the Inftruments, which had been 
obferved before. 
At another Place the Barometer, at a Medium for 14 
Days, flood lower by 4. 46. and the Thermometer was 
lower by 4. deg. 4. At another Place, which was very 
high upon the Moors, the Barometer, at a Medium for. 
ten Days, flood lower by o. 65. and the Thermometer* 
fell 79. 
J 
