"Yes, there is vapor in the jar," he said.
"Good! That's the stuff!" cried Jack. "Now I guess Professor
Lenton will admit that I'm right."
He turned the Bunsen flame up higher. A moment later he uttered
a cry, for he saw the cork being forced from the test tube. The
pressure of the new gas was too much for it.
"Lookout!" cried Jack. "She's going up!"
Then followed a sharp explosion, and the laboratory seemed filled
with fragments of broken glass and torn books.
CHAPTER II
JACK MAKES OXYGEN
"There it goes! There it goes!" cried Mark, making a dive for
the laboratory door, but slipping and sprawling on the floor.
"There it goes, Jack!"
"No; it's gone already!" cried Jack, who, even in the midst of
danger and excitement, seemed to remain calm and still to have
his appreciation of it joke.
"Come on!" cried Mark as he scrambled to his feet. "We must get
out of here, Jack!"
"What's the use now? It's all over."
There was a tinkling sound, as fragments of the broken test tube,
the bell-jar and other things began falling about the room.
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