[ 57 6 ] 
make no obfervations upon the weight of the air ; 
but with the thermometer I obferved, that when we 
got there, in rainy weather, the glafs fhewed i y de- 
grees above temperate, at fun-fet 2 degrees ; in the 
night y degrees below temperate ; and at day-break 
8 degrees. The thermometer, placed at the entrance 
of the cave, and fheltered from the wind, fhewed y 
degrees of cold ; and expofed to the wind on the out- 
fide, where I felt a very fliarp cold, only 2 degrees ; 
fo that there was three degrees difference, which fur- 
prized me, as my natural thermometer, I mean my 
body, convinced me of the contrary. I was very 
cold without, and felt little or no cold within ; where- 
as the obfervations by the thermometer fhewed the 
reverfe. I had obferved in the plains below, that it 
fhewed about 10 degrees above temperate. By the 
report, that was made us, the night we fpent at the 
brimftone-hill had been as cold, the wind had blown, 
the air was very damp, and we had found but y de- 
grees of cold ; fo that there was 1 8 degrees difference 
between the brimftone hill and the plains. 
We fpent the night very fnug upon beds of fern, 
with a good fi re at the mouth of the cave, and were 
much lefs troubled with the cold than I expected in 
fo bleak a place. 
We came down by the Tarare, which, as I have 
obferved, is a very ffeep defeent. You let yourfelf 
down upon a narrow ridge. On each fide are pre- 
cipices, which indeed do not look frightful, becanfe 
they are covered with trees which conceal them. Half- 
way down the mountain you find a hot fpring, that 
has nothing particular. At laft we got to our 
horfes, 
