"Pretty far off yet," observed Dick. "But it is coming this way fast."
"I wonder what those foolish Trailers are going to do?" put in Tom Clifton. "They are running a pretty big risk to stay away out there."
A glance through the field-glass showed that the other boat was still headed away from the shore.
"We can't go off and leave them," said Bob Somers, soberly. "Their boat is not as safe as ours, and they seem bound to get into trouble."
In the hope of attracting the Nimrods' attention, Bob and the rest of the boys brought out their guns and fired several shots.
The reports must have been heard, but there was no visible result.
A cool, steady current of air was now blowing in their faces, and the appearance of the scene began to rapidly change. The advance-guard of big white clouds passed slowly across the sun, shutting off its cheerful rays completely. The flashes in the distance became more frequent, while a low rumble of thunder borne on the breeze reached their ears.
"The storm will soon be in full blast," exclaimed Dave Brandon. "Those clouds are a great sight. Whew, what a flash that was!"
A streak of dazzling brilliancy divided the heavens, followed in a few moments by a heavy peal of thunder.
"Do you think we had better try to make the shore?" ventured Tom Clifton, nervously.