s. There, plain enough, was the Thiergarten; beyond rose
the imperial palace, and to the right those tall buildings, those
clustering, beflagged, bemasted roofs, must be the offices in which
the Central European staff was housed. It was all coldly clear and
colourless in the dawn.

He looked up suddenly as a humming sound grew out of nothing and became
swiftly louder. Nearly overhead a German aeroplane was circling down
from an immense height to challenge him. He made a gesture with his left
arm to the gloomy man behind and then gripped his little wheel with both
hands, crouched over it, and twisted his neck to look upward. He was
attentive, tightly strung, but quite contemptuous of their ability to
hurt him. No German alive, he was assured, could outfly him, or indeed
any one of the best Frenchmen. He imagined they might strike at him as
a hawk strikes, but they were men coming down out of the bitter cold up
there, in a hungry, spiritless, morning mood; they came slanting down
like a sword swung by a lazy man, and not so rapidly but that he was
able to slip away from under them and get between them and Berlin. They
began challenging him in German with a megaphone when they were still
perhaps a mile away. The words came to him, rolled up into a mere blob
of hoarse sound. Then, gathering alarm from his grim silence, they gave
chase and swept down, a hundred yards above him perhaps, and a couple of
hundred behind. They were beginning to understand what he was. He ceased
to watch them and concentrated himself on the city ahead, and for a time
the two aeroplanes raced....

A bullet came tearing through the air by him, as though some one was
tearing paper. A second followed. Something tapped the machine.

It was time to act. The broad avenues, the park, the palaces below
rushed widening out nearer and nearer to them. 'Ready!' said the
steersman.

The gaunt face hardened to grimness, and with both hands the
bomb-thrower lifted the big atomic bomb from the box and steadied it
against the side. It was a black sphere two feet in diameter. Between
its handles was a little celluloid stud, and to this he bent his head
until his lips touched it. Then he had to bite in order to let the air
in upon the inducive. Sure of its accessibility, he craned his neck over
the side of the aeroplane and judged his pace and distance. Then very
quickly he bent forward, bit the stud, and hoisted the bomb over the
side.

'Round,' he whispered i