"Somebody seems to be shaking a handkerchief or something else white,"
he observed. "And it don't look like just waving at the steamer either,
for they do it after a system, as we would signal with wigwag flags.
There, I counted seven times he did it; then comes a halt, and one, two,
three times, another halt; and once more he starts in, this time three,
four, five, and then stops. Now, what do you suppose the fellow means by
that, and who can he be waving to, Frank?"

"You'd expect it might be some one out on the lake; can you see any
small boat in sight, Andy; or any one waving back from another point?"

"Not a thing, as far as I can see," replied the boy with the marine
glasses.

"Suppose you try the steamer, then," suggested Frank, meaningly.

Immediately Andy gave an exclamation of astonishment.

"I see a signal moving, Frank, and it seems to be copying the one on
shore," he hastened to remark, excitedly.

"Where does it come from, the passengers that I saw pushing up against
the rail, and staring at us; are any of them interested, do you think?"
continued Frank, who just then could not turn his head to look, but must
depend on his chum.

"Well, no," answered Andy, "it seems to come from the pilothouse, and
must be Todd Pemberton, himself."