was jerked tight and the explosion take place in mid-air above the
street. So he arranged a spiral spring between can and cord to take up
harmlessly the shock caused by the momentum of the package when the
string became suddenly taut. He saw that the weak part of his project
was the fact that everything would depend on his own nerve and accuracy
of aim at the critical moment, and that a slight miscalculation to the
right or to the left would cause the bomb, when falling down and in, to
miss the door altogether. He would have but one chance, and there was
no opportunity of practising. However, Dupré, who was a philosophical
man, said to himself that if people allowed small technical
difficulties to trouble them too much, nothing really worth doing would
be accomplished in this world. He felt sure he was going to make some
little mistake that would ruin all his plans, but he resolved to do
the best he could and accept the consequences with all the composure at
his command.

As he stood by the window on the fatal night with the canister in his
hand he tried to recollect if there was anything left undone or any
tracks remaining uncovered. There was no light in his room, but a fire
burned in the grate, throwing flickering reflections on the opposite
wall.

"There are four things I must do," he murmured: "first, pull up the
string; second, throw it in the fire; third, draw out the nail; fourth,
close the window."

He was pleased to notice that his heart was not beating faster than
usual. "I think I have myself well in hand, yet I must not be too cool
when I get downstairs. There are so many things to think of all at one
time," he said to himself with a sigh. He looked up and down the