“Sure—all we had,” and Frank spoke a little bitterly.

“Where did it happen?”

“In the aquarium. The men ran over here. One went up to take the train. Maybe we can catch him.”

“Maybe,” agreed the officer. “We’ll have a try. Come on—sprint!”

He himself led the way up the elevated stairs, followed by Frank, Ned and some curious ones.

But the train had pulled out, and save for the ticket-chopper there was no one on the platform.

“Do you see him?” demanded the officer, rather needlessly.

“No,” answered Frank. “He’s gone all right. And I guess there’s no use chasing after the other one.”

“Give me a description of them,” suggested the policeman, “and I’ll report it. The detectives will do what they can, but I guess I needn’t tell you there isn’t much chance,” went on the officer. He evidently regarded Frank and Ned as New York lads, and indeed they had the smart appearance of those who are familiar with the metropolis.

“No, I guess we can score that up to profit and loss,” said Frank, gloomily.