Tom did not sleep well the remainder of the night, for his fitful slumbers were disturbed by dreams of enormous caves, filled with diamonds, with dark, shadowy figures trying to put him into a red-hot steel box. Once he awakened with a start, and put his hand under his pillow to feel if the two stones Mr. Jenks had given him, were still there. They had not been disturbed.

Tom made up his mind to find out if the stones were really diamonds, before saying anything to his father about the chance of going to seek Phantom Mountain. And the young inventor wished to get the opinion of some other jeweler than Mr. Track—at least, at first.

"Though if this one proves to be a good gem, I'll have Mr. Track set it in a brooch, and give it to Mary for her birthday," decided the young inventor. "Guess I'll take a run over to Chester in the Butterfly, and see what one of the jewelers there has to say."

In addition to his big airship, Red Cloud, Tom owned a small, swift monoplane, which he called Butterfly. This had been damaged by Andy Foger just before Tom left on the trip that ended at Earthquake Island, but the monoplane had been repaired, and Andy had left town, not having returned since.

Telling his father that he was going off on a little business trip, which he often did in his aeroplane, Tom, with the aid of Mr. Jackson, the engineer, wheeled the Butterfly out of its shed.

Adjusting the mechanism, and seeing that it was in good shape, Tom took his place in one of the two seats, for the monoplane would carry two. Mr. Jackson then spun the propellers, and, with a crackle and roar the motor started. Over the ground ran the dainty, little aeroplane, until, having momentum enough, Tom tilted the wing planes and the machine sailed up into the air.

Rising about a thousand feet, and circling about several times to test the wind currents, Tom headed his craft toward Chester, a city about fifty miles from Shopton.