you how."

So Miss Mary took a piece of paper, and cut it into the proper shape
with her scissors, and then rolled it up into a long and very slender
roll; one end of it was not much larger than a large knitting-needle.
She gave this to Rollo, and told him that, if he tried the experiment
again, he must light the small end, and it would make a flame not so
big as a pea.

Rollo explained to Jonas what Miss Mary had said, and they resolved on
attempting the experiment again that evening. And they did so. Dorothy
stood by watching the process, as she had done the evening before, but
Rollo did not assert so confidently and positively what the result would
be. He had learned moderation by the experience of the night before.

When all was ready, Jonas lighted the end of the slender roll in the
lamp, and plunged it carefully into the tumbler. It went out
immediately.

"There!" said Rollo, clapping his hands, "it goes out."

"Why, it is only because the wind blew it out."

"No, Dorothy," said Rollo, "there isn't any wind in the tumbler."

"Yes," replied Dorothy, "when you push it down, it makes a little wind,
just enough to blow it out."

"Get another tumbler," said Jonas, "and let us see."

So Dorothy brought another tumbler, and Jonas put the burning end of
the paper down into it, with about as rapid a motion as that with which
he had put it before into the tumbler he had at first. The paper
continued to burn.

"There," said he to Dorothy, "when I put it down into common air, it
burns on the same as ever; so it can't be that the wind puts it out."
Jonas repeated the experiment a number of times; the effect was always
the same. Whenever he put it into the tumbler of common air, it burned
on without any change; but whenever he put it into the choke damp, it
immediately went out. Even Dorothy was satisfied that there was a
difference in the kind of air contained in the two tumblers.

That evening, when Rollo gave his mother a full account of their
attempts,--describing particularly their failure at first, and their
subsequent successes,--his mother seemed much interested. When he had
finished, she said,--

"Well, Rollo, I don't see but that you have learned two lessons in
philosophy."

"Two lessons?" said Rollo.

"Yes," replied his mother. "The first is, that fire will not burn in
choke damp; and the second is, that it requires nice attention and care
to verify philosophical truths by experiment."

"Yes," sai