C is ] 
to the quality of the matter then in motion within; 
The air was fo very pure and keen in the whole 
upper region of Etna, and particularly in the mod 
elevated parts of it, that we had a difficulty in re- 
fpiration, and that, independent of the fulphureous 
vapour, I brought two barometers and a thermo- 
meter with me from Naples, intending to have left 
one with a perfon at the foot of the mountain, whild 
we made our obfervations with the other, at fum 
riling, on the fumrnit ; but one barometer was un- 
luckily fpoilt at fea, and I could find no one expert 
enough at Catania to repair it 3. what is extraordinary, 
] do not recolleft having feen a barometer in any 
part of Sicily, At the foot of Etna, the 24th, when 
we made our firft obfervation, the quicklilver Hood at 
27 degrees 4 lines, and the 26th, at the mod elevated 
point of the volcano, it was at 18 degrees 10 lines. 
The thermometer, on the fird obfervation at the foot 
of the mountain was at 84 degrees,, and on the 
fecond at the crater at 56. The weather had not 
changed in any refpedt, and was equally line and 
clear, the 24th and 26th. We found it difficult to 
manage our barometer in the extreme cold and high 
wind on the top of Etna; but from the mod exadt 
obfervations we could make, in our circum dances, 
the refult was as abovementioned. The canon 
allured me, that the perpendicular height of mount 
Etna is fomething more than three Italian miles, and 
I verily believe it is fo. 
After having pafled at lead three hours on the 
crater, we defeended and went to a riling ground, 
about a miledidant from the upper mountain we had 
jud left, and faw there feme remains of the foum 
datioiv 
