Q.From what?
A.
From fire-damp?
Q.What is it?
A.A sort of air that blows up like gun-powder.

Q.From what more are they in danger?
A.The roofs falling in.

Q.From what more?
A.From bad air which often smothers them.

Q.
What is made from coal to light the streets?
A.Gas.

Q.What is coal called after the gas has been taken from it?
A.Coke.