will be all right now, thank
goodness! they have blown up the wear."

The words were scarcely out of his mouth when he heard a loud sullen
roar, speedily followed by a tremendous hiss, and a rumbling thunder,
that shook the very earth where he stood, two miles distant.

This is what had taken place since he left the reservoir, but ten
minutes ago.

Mr. Tucker and Mr. Carter laid the gunpowder and the train, and lighted
the latter, and came back across the middle of the embankment.

Being quite safe here from the effect of the explosion, Mr. Tucker was
desirous to establish by measurement that the water in the reservoir had
not risen so high as the crack in the embankment.

With this view he took out a measure, and, at some risk of being swept
into eternity, began coolly to measure the crack downward.

At this very time water was trickling over; and that alarmed Carter, and
he told Tucker they were trifling with their own lives.

"Oh," said Tucker, "that is only the spray from the waves."

They actually measured the crack, stooping over it with their lanterns.

When they had done that, Carter raised his head, and suddenly clutched
Tucker by the arm and pointed upward. The water was pouring over the
top, still in a thin sheet, but then that sheet was gradually widening.
The water came down to their feet, and some of it disappeared in the
crack; and the crack itself looked a little larger than when last
inspected. Tucker said, gravely, "I don't like that: but let me examine
the valve-house at once." He got down to the valve-house, but before
he could ascertain what quantity of water was escaping Carter called to
him, "Come out, for God's sake, or you are lost."

He came running out, and saw an opening thirty feet wide and nearly a
foot deep, and a powerful stream rushing over it.

The moment Tucker saw that, he cried, "It's all up, the embankment must
go!" And, the feeling of the architect overpowering the instincts of the
man, he stood aghast. But Carter laid hold of him, and dragged him away.

Then he came to himself, and they ran across the embankment.

As they started, the powder, which had hung fire unaccountably, went
off, and blew up the waste-wear; but they scarcely heard it; for, as
they ran, the rent above kept enlarging and deepening at a fearful
rate, and the furious stream kept rushing past their flying heels, and
threatened to sweep them sideways to destruction.

They were safe at last; but eve