On the following morning the Spanish spy, weary and cramped with his long vigil, was amazed to see an utter stranger emerge cautiously from beneath the wharf he had been watching, and walk quickly away. For a moment the spy was undecided as to whether he should follow this person or seek to discover where he had come from. Then choosing the former course, he followed Professor Rivers at a respectful distance, until he had the vast satisfaction of seeing him meet, near the custom-house, the captain of the tug that was avowedly bound for Havana.

There was a connection then between those who hid beneath the wharf and the suspected tow anchored in the harbour. Undoubtedly a store of contraband goods was concealed under the wharf, and an effort would be made to convey them on board the tug before she sailed. What a reward was in prospect for him could he but discover it!

A little later the spy, with two companions, all armed, occupied a skiff that made its way cautiously through the dark spaces beneath the wharf he had watched so long. Suddenly between them and the outer daylight two men appeared one after the other. Both slid down one of the piles supporting the pier and dropped into the water, or at least the exulting spy thought they did so as he hastily urged his boat in that direction.

To his amazement and disgust, when he reached the spot where they had disappeared, he could discover no trace of them. Neither was there a boat or a hiding-place into which they could have gone. The man was furious at being thus baffled, and uttered many a fierce Spanish oath. Finally, convinced that further search in that direction was fruitless, he pulled out into the harbour to watch the mysterious tow that still lay at anchor. As he drew near to it he saw its captain come off from shore alone. Then the guard from one of the revenue cutters was withdrawn, anchors were lifted, and the tow began to move slowly down the channel. It was certain that no one save the captain had gone aboard, nor had any cargo been taken in except a few tons of carefully examined coal.

Never in his life had the spy been so puzzled and disappointed; but it was a slight consolation to know that Spain's vigilant cruiser would accompany the Gringos to Havana. Even now was the black-hulled warship preparing to follow the departing tow. As the massive anchor broke away from the bottom, her great screw began to churn the water, and she slowly forged ahead. Suddenly her screw ceased to act, she took a sheer in the wrong direction, there was a vast amount of confusion on her decks, and in another 

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