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the three days when the stowaway had been kept a prisoner, the Red Cloud had made good time on her western trip. She was now about two hundred and fifty miles from Leadville, Colorado, and Tom knew he could accomplish that distance in a short time. It was necessary, therefore, since they were so close to the place where the real search would begin, to make some more definite plans.

"We will need to replenish our supply of gasoline," said Tom, shortly after the stowaway had been dropped, and when the young inventor had made a general inspection of the airship.

"Is it all gone?" inquired Mr. Damon.

"Not all, but we will soon be in the wildest part of the Rocky Mountains, and gasoline is difficult to procure there. So I want to fill all our reserve tanks. But I would rather do that before we get far into Colorado."

"Why?" inquired Mr. Parker.