"
"No, sir. It was my own apparatus I was using," explained Jack.
"I'll be more careful next time. I'll not put in so much of the
chemical."
"I don't believe there had better be a 'next time' right away,"
declared Mr. Lenton.
"The next attempt you make to invent a powerful gas, you had
better generate it in something stronger than a glass test tube.
Use an iron retort."
"Yes, sir," replied Jack.
"And now you had better report for your geometry lesson," went on
the professor. "I need the laboratory now for a class in
physics. Just tell the janitor to come here and sweep up the
broken glass. I am very glad neither of you boys was seriously
injured. You must be more careful next time."
"Oh, Mark was careful enough," said Jack. "It was all my fault.
I didn't think the gas was quite so powerful."
"All right," answered the professor with a smile as Jack and Mark
passed out on their way to another classroom.
The two lads, whom some of my readers have met before in the
previous books of this series, were friends who had become
acquainted under peculiar circumstances.
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