sputtering engine of death to the edge of the bridge. With a supreme
effort he hurled it from him. A moment later a splash told that it had
landed in the river below.

"That'll never do any more harm," he gasped faintly.

"Stay there, Hugh!" shouted Bob. "Look out for the train!"

The two boys crowded close against the side of the bridge and a moment
later a heavy train thundered past them. Through the lighted windows
could be seen crowds of passengers, and Hugh and Bob shuddered as they
thought what might have happened to the train with its load of precious
human freight had the bomb exploded. They felt faint and weak after their
experience and presently sat down until their shattered nerves should
have recovered somewhat from the shock.

The night was cool, but Bob mopped his perspiring brow. "Whew," he
gasped. "That was a close call."

"I should say it was," echoed Hugh. "What luck that you should have
seen those sparks when you did! There was only a couple of inches of
fuse left."

"Lucky you were with me too," said Bob soberly. "If I'd been alone I
think I would have run for home."

"Haven't you two gone home yet?" demanded a voice, and the two boys
looked up to see Harold standing over them.

"Not yet," said Bob.