city of gold, but the gold wasn't of as fine a grade as we hoped."
"Well, nothing like that can happen in this platinum deal. It sure is rich ore that Mr. Petrofsky and his brother found. Poor fellow! To think of being an exile in that awful country, not knowing where you may be sent next. No wonder Mr. Petrofsky wants to rescue him."
"That's right. Well, here we are. I wonder what your father will say when he hears you're thinking of another expedition, Tom?"
"Oh, he'll want me to go when he hears about the exile."
"And I'm sure my folks will let me go. How about Mr. Damon?"
"I don't believe we can hold him back. It will make a nice party, just you and I, and Mr. Damon and Mr. Petrofsky. That will leave room for the other Russian—if we can rescue him," and with that Tom shut off the engine and glided to earth.
It may well be imagined that Mr. Swift was surprised when his son told him the latest news, but he did not offer any serious objection to the young inventor going to Siberia.
"Only you must be careful," he said. "Those Russian officers are ugly when it comes to trying to take away any of their prisoners. And this air glider—I don't exactly know about that. It's
