[ 127 ] 
and their watch adjufted by my regulator, they care- 
fully remarked the hour and minute each obferva- 
tion was made, which on their return was compared 
with the height of the thermometer and barometer 
in my ftudy at the time of the obfervation, of 
which I had kept an exadl account during the 
journey. From which obfervations I have formed 
the following table, fuppofing the defcent of the 
barometer of an inch for every 90 feet. 
Defcent of 
Barom. 
Elevat, at 90 
feet for one 
tenth of in, 
Defcent of 
Therm. 
Elevat. correfpond- 
ing to each Degree 
of Thermometer. 
In. 
Dec. 
Feet. 
Degrees'. 
Feet. 
0. 
4 
360 
2 
180 
I. 
2 
1080 
5 1 
1964 
I. 
3 
1170 
6 
195 
1. 
5 
1350 
9 
150 
I. 
65 
1485 
10 
148,5 
3 - 
75 
3375 
17 
198 
A- 
2 
3780 
19 
199 
5 - 
I 
4590 
18 
255 
I fufpedt the juftnefs of the laft obfervation, it be- 
ing made at noon on the fummit of the mountain, 
the fun Ihining very hot, and no proper (hade for 
the inftruments. ‘ ’ 
N, B. The thermometers were Fahrenheit’s. 
Although the different degrees of heat in different' 
places muft depend greatly on the accident of fitu-' 
ation, with regard to mountains, valleys, and 
different foils, &c. yet there is fo much regularit^^ th 
the above obfervations, that, perhaps, Vv’e fliall "not 
eiT 
