It did not interrupt the terrestrial fusillade.

At last a shell exploded a few feet below the "Albatross," and then she mounted into the inaccessible regions of the sky.
Nothing happened during the few following days of which the prisoners could take advantage.

The aeronef kept on her course to the southwest, thereby showing that it was intended to take her to India.
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.
Leaning against the fore-cabin, so as to keep their places notwithstanding the speed of the ship, they watched these colossal masses, which seemed to be running away from the aeronef.
"The Himalayas, evidently," said Phil Evans; "and probably Robur is going round their base, so as to pass into India." "So much the worse," answered Uncle Prudent.