"He might have blown up the whole
projectile by tampering as he did with the machinery. Had I been
testing the large, instead of the small motor, there would have been
nothing left of the _Annihilator_, or us, either. Who could have done
this? If that crazy machinist is around again----"
"I don't believe he could get here from Mars," interrupted Jack, with a
smile.
"Hardly," added Mark.
"No, I guess he is still on the Red Planet, so it couldn't have been
him," went on Mr. Roumann. "But it was some one."
Jack and Mark at once thought of the odd man who had sent Mark the
note, and then had run away.
"Could it have been him?" suggested Jack.
"It's possible," remarked Professor Henderson. "We must be on our
guard. I wonder if Washington----"
At that moment there sounded a violent pounding on the exterior of the
projectile, and the voice of the colored man could be heard calling:
"Am anything de mattah? Andy Sudds an' I is out heah, an' we heard
suffin goin' on in dere.
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