This sort of air is so heavy, that no man can live in it nor any living thing exist in it.
They let a cat down into the well, and as soon as it reached the place where the bad air was, it immediately died.
Not only can no living thing live in it, but a candle cannot burn in it.
They let down a candle, and as soon as it reached the same place, it was immediately extinguished.
2
There are places under the earth where this bad air accumulates; and if you should go into them, you would immediately perish. Hence in mines they have lamps, and before a man goes into such a place they let a lamp down first.
If the lamp goes out, then it is impossible for a man to enter. So they send down a supply of fresh air until the lamp will burn. Near the city of Naples there is such a grotto. In it the bad air always stands to a height of an arshin[1] above the ground, and above that the air is pure. A man can walk through this grotto and receive no harm; but as soon as a dog enters, he chokes to death.
Whence comes this bad air?
It is made out of the same good air which we breathe. If many people are collected in one room, and all the doors and windows are shut so that no fresh air can get in, then the atmosphere becomes the same as in the well, and the people perish.
A hundred years ago the Hindus shut one hundred and forty-six Englishmen into a dungeon, and locked them up in an underground hole, where the air could not get to them.
The imprisoned Englishmen, after they had been there a few hours, began to choke, and at the end of the night one hundred and twenty-three of them were dead, and the rest were taken out barely alive, and ill.
- ↑ 2.33 feet.
