The workmen who had said scarcely a word till then, raised an assenting murmur at the voice of common sense.

Mountain admitted it could do no harm, and gave an order accordingly; screws wore applied and the valves of the double set of sluice-pipes were forced open, but with infinite difficulty, owing to the tremendous pressure of the water.

This operation showed all concerned what a giant they were dealing with; while the sluices were being lifted, the noise and tremor of the pipes were beyond experience and conception. When, after vast efforts, they were at last got open, the ground trembled violently, and the water, as it rushed out of the pipes, roared like discharges of artillery. So hard is it to resist the mere effect of the senses, that nearly every body ran back appalled, although the effect of all this roaring could only be to relieve the pressure; and, in fact, now that those sluices were opened, the dam was safe, provided it could last a day or two.

Lights were seen approaching, and Mr. Tucker, the resident engineer, drove up; he had Mr. Carter, one of the contractors, in the gig with him.

He came on the embankment, and signified a cold approval of the sluices being opened.

Then Ransome sounded him about blowing up the waste-wear.

Tucker did not reply, but put some questions to a workman or two. Their answers showed that they considered the enlargement of the crack a fatal sign.

Upon this Mr. Tucker ordered them all to stand clear of the suspected part.