utes later, and we would have been discovered."
"As it is we're right over their heads, and they don't know it," chuckled Tom. The airship was moving silently along before a good breeze, the propellers not having been started, and Tom let her drift for several miles, as he did not want to give the police spies a clew by the noise of the motor.
The twinkling lights in the forest clearing disappeared from sight, and the seekers went on in the darkness.
"Well, we've got the hardest part of our work yet ahead of us," remarked Tom several hours later when, the lights having been set aglow, they were gathered in the main cabin. There was no danger of being seen now, for they were quite high.
"We've done pretty well, so far," commented Ned. "I think we will have easier work rescuing Mr. Petrofsky's brother than in locating the mine."
"I don't know about that," answered the Russian. "It is almost impossible to rescue a person from Siberia. Of course it is not going to be easy to locate the lost mine, but as for that we can keep on searching, that is if the air glider works, but there are so many forces to fight against in rescuing a prisoner."
