Twelve hours after leaving Peking, Uncle Prudent and Phil Evans
caught a glimpse of the Great Wall in the neighborhood of Chen-Si.
Then, avoiding the Lung Mountains, they passed over the valley of the
Hoangho and crossed the Chinese border on the Tibet side.

Tibet consists of high table-lands without vegetation, with here and
there snowy peaks and barren ravines, torrents fed by glaciers,
depressions with glittering beds of salt, lakes surrounded by
luxurious forests, with icy winds sweeping over all.

The barometer indicated an altitude of thirteen thousand feet above
the level of the sea. At that height the temperature, although it was
in the warmest months of the northern hemisphere, was only a little
above freezing. This cold, combined with the speed of the
"Albatross," made the voyage somewhat trying, and although the
friends had warm traveling wraps, they preferred to keep to their
cabin.

It need hardly be said that to keep the aeronef in this rarefied
atmosphere the suspensory screws had to be driven at extreme speed.
But they worked with perfect regularity, and the sound of their wings
almost acted as a lullaby.

During this day, appearing from below about the size of a carrier
pigeon, she passed over Garlock, a town of western Tibet, the capital
of the province of Cari Khorsum.

On the 27th of June, Uncle Prudent and Phil Evans sighted an enormous
barrier, broken here and there by several peaks, lost in the snows
that bounded the horizon.