Jack, who was somewhat older
than his companion, was of a more adventurous turn of mind, and
was constantly trying new things. Not always safe ones, either,
for often he had produced small explosions in the laboratory of
the college. Only minor damage had been done thus far, but, as
Mark said, one could never tell what was going to happen when
Jack mixed certain things in test tubes and placed them over a
spirit lamp, or the flame of a Bunsen burner.
"Have you got that tube under the jar?" asked Jack as he lighted
a large Bunsen flame.
"It's under," answered Mark. "But say, what are you going to do
in case you prove that your theory is right, and that you can
make a new kind of gas? What good will it be?"
"Lots of good. If I'm right, this will be the lightest gas ever
made. Much lighter than hydrogen--"
"Lighter than the kind Professor Henderson made for use in the
Flying Mermaid, in which we went to the center of the earth?"
"No, I'm afraid I can't equal his gas; but then, no one can ever
hope to. I'm going to make a new gas, though, and I'll show you
that it will be much lighter and more powerful than hydrogen.
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