was is all used up, and the candle is gone. So the flame, uncle, you
see, is the last of the candle, and the candle seems to go through the
flame into nothing--although it doesn't, but goes into several things,
and isn't it curious, as Professor Faraday said, that the candle
should look so splendid and glorious in going away?"

"How well he remembers, doesn't he?" observed Mrs. Wilkinson.

"I dare say," proceeded Harry, "that the flame of the candle looks
flat to you; but if we were to put a lamp glass over it, so as
to shelter it from the draught, you would see it is round,--round
sideways and running up to a peak. It is drawn up by the hot air; you
know that hot air always rises, and that is the way smoke is taken up
the chimney. What should you think was in the middle of the flame?"

"I should say fire," replied Uncle Bagges.

"Oh, no! The flame is hollow. The bright flame we see is something
no thicker than a thin peel, or skin; and it doesn't touch the wick.
Inside of it is the vapor I told you of just now. If you put one end
of a bent pipe into the middle of the flame, and let the other end of
the pipe dip into a bottle, the vapor or gas from the candle will mix
with the air there; and if you set fire to the mixture of gas from the
candle and air in the bottle, it would go off with a bang."

"I wish you'd do that, Harry," said Master Tom, the younger brother of
the juvenile lecturer.

"I want the proper things," answered Harry. "Well, uncle, the flame
of the candle is a little shining case, with gas in the inside of it,