These tubes and the wires are water-proofed.

The negro is only the dastardly workman in this case.

It was never he who invented the trick.

But he must be an excellent workman, who ought to be employed in much more honest effort.

I wonder if the fellow is going to use more than four tubes ?" All of these thoughts ran through the mind of Tom as he crouched, peering eagerly at the negro.
By this time the negro was taking to the water, towing his miniature scow and its explosive cargo as he swam.
"He must be a good swimmer, and also a good diver," concluded Tom.