Now place the cover on the top of the jar and wait the results.

Soon the candle burns dimly and in a little time the light goes out altogether.
~3.~ What do you think is the reason that the candle will not burn when shut up in a bottle?
A candle uses air when it burns.

If shut up in a small, tight place, it soon uses up so much air that it can burn no longer.

Try the experiment again, and when the candle begins to burn dimly, take it out quickly.

We see that at once the light burns bright again.
~4.~ Suppose we shut the stove draught tight, what is the result?
The fire will burn low, and after a time it will probably go out.