In fact, with the Cardite we brought back from Mars, we have no
lack of money, so we really do not need the diamonds."
It was decided, in view of the shock and upset caused by the explosion,
that no further work would be done that day, and so, after carefully
locking the shed, and posting Andy on guard with his gun, the boys and
the professor went into the house to discuss matters, and plan for work
the next day.
"Mark," said Jack in a low voice, as they followed the two scientists,
"I think it's up to us to try to find that mysterious man who sent the
note. I think he did this mean trick!"
"So do I, and we'll have a hunt for him. Let's go now."
CHAPTER VI
ON THE TRACK
The two boys gazed after Professors Henderson and Roumann. The
scientists were deep in a discussion of various technical matters,
which discussion, it was evident, made them oblivious to everything
else.
"Shall we ask them?" inquired Jack in a whisper.
"No; what's the use?" queried Mark.
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