"
"Oh, here's the tube," said Mark as he passed it over. "But
please be careful, Jack."
Jack measured out some black chemical that resembled gunpowder,
and poured it into the test tube which Mark handed him. Then he
inserted in the opening a cork, from which extended a glass tube,
to the outer end of which was fastened a rubber pipe.
He paused in his experiment to laugh again.
"What are you making--laughing gas?" asked Mark.
"No. But--excuse me--ha, ha! I can't help laughing when I
think of the way you ducked under the table the other day."
"Maybe you'll laugh on the other side of your countenance, as
Washington White would say," commented Mark; "especially if that
big tube bursts."
"But it isn't going to burst."
"How do you know?"
"Well, I worked out this experiment carefully. I've calculated
just how strong the new gas will be, and--"
"Ah, that's just it. It's a new gas, and you've never yet
succeeded in making it, have you?"
"No; but--"
"And it takes a different combination of chemicals to make it
from any you ever experimented with before, doesn't it?" asked
Mark.
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