“I guess I’ve given them something to think over,” she said mischievously, flinging back a brilliant smile at the dazed young officer.

“Now,” she exclaimed the next moment, “for a distance flight.  I’m anxious to put the Golden Butterfly through all her paces.  Oh, by the way, the balancer.  I haven’t shown you how that works yet.”

If Peggy’s bright eyes had not been veiled by goggles, the officer might have seen a mischievous gleam flash into them, like a wind ripple over the placid surface of a blue lake.

Suddenly the aeroplane slanted to one side, as if it must turn over.  Peggy had banked it on a sharp aerial curve.  The young officer, in spite of himself, in defiance of his training, gave a gasp.

“I say——­”

But the words had hardly left his lips before the aeroplane was back on a level keel once more.  At the same time a rasping, sliding sound was heard.

“Like to see how that was done?” asked Peggy, with a bewitching smile.

“Yes.  By Jove, I thought we were over for an instant.  But how——­”

“That we shall be glad to show you when the United States government has contracted for a number of the Prescott aeroplanes,” retorted Peggy.

The young officer bit his lip.

“Confound it,” he thought, “is this chit of a girl making fun of me?”

Young officers have a high idea of their own dignity.  Mr. Bradbury colored a bit with mortification.  But Peggy quickly dispelled his temporary chagrin.

“You see,” she explained, “it would never do for us to reveal all our secrets, would it?  You agree with me, don’t you?”

“Oh, perfectly.  You are quite right.  Still, I confess that you have aroused all my inquisitiveness.”

Peggy being busied just then with a bit of machinery on the bulkhead separating the motor from the body of the chassis, made no reply.  But presently, when she looked up, she gave a sharp exclamation.

The sky, as if by magic, had grown suddenly dark.  Above the pulsating voice of the motor could be heard the rumble of thunder.  All at once a vivid flash of lightning leaped across the horizon.  One of those sudden storms of summer had blown up from the sea, and Peggy knew enough of Long Island weather to know that these disturbances were usually accompanied by terrific winds—­squalls and gusts that no aeroplane yet built or thought of could hope to cope with.

“We’re running into dirty weather, it seems,” remarked the officer.  “I thought I noticed some thunderheads away off on the horizon when we first went up.”

“I wish you’d mentioned them then,” said the straightforward Peggy; “as it is, we’ll have to descend till this blows over.”

“What, won’t even the wonderful equalizer render her safe?”

“No, it won’t.  It will do anything reasonable.  But you’ve no idea of the fury of the wind that comes with these black squalls.”