pproaching the
lawless and dangerous dominions of the Orient.

When, at last, he opened his eyes, he was puzzled to determine where he
was. Beneath him stretched a vast, sandy plain, and speeding across
this he came to a land abounding in luxuriant vegetation.

The centrifugal force which propelled him was evidently, for some
reason, greatly accelerated, for the scenery of the country he was
crossing glided by him at so rapid a rate of speed that it nearly took
his breath away.

"I wonder if I've passed Vienna in the night," he thought. "It ought
not to have taken me more than a few hours to reach there from Paris."

Vienna was at that moment fifteen hundred miles behind him; but Rob's
geography had always been his stumbling block at school, and he had not
learned to gage the speed of the traveling machine; so he was
completely mystified as to his whereabouts.

Presently a village having many queer spires and minarets whisked by
him like a flash. Rob became worried, and resolved to slow up at the
next sign of habitation.

This was a good resolution, but Turkestan is so thinly settled that
before the boy could plan out a course of action he had passed the
barren mountain range of Thian-Shan as nimbly as an acrobat leaps a
jumping-bar.

"This won't do at all!" he exclaimed, earnestly. "The traveling
machine seems to be running away with me, and I'm missing no end of
sights by scooting along up here in the clouds."

He turned the indicator to zero, and was relieved to find it obey with
customary quickness. In a few moments he had slowed up and stopped,
when he found himself suspended above another stretch of sandy plain.
Being too high to see the surface of the plain distinctly he dropped
down a few hundred feet to a lower level, where he discovered he was
surrounded by billows of sand as far as his eye could reach.

"It's a desert, all right," was his comment; "perhaps old Sahara
herself."

He started the machine again towards the east, and at a more moderate
rate of speed skimmed over the surface of the desert. Before long he
noticed a dark spot ahead of him which proved to be a large body of
fierce looking men, riding upon dromedaries and slender, spirited
horses and armed with long rifles and crookedly shaped simitars.

"Those fellows seem to be looking for trouble," remarked the boy, as he
glided over them, "and it wouldn't be exactly healthy for an enemy to
get in their way. But I haven't time to