"Hello! what do you mean, sir, by following us?" cried Carl Baldwin, seizing the stranger's arm as he spoke.

With a muttered oath the man wrenched himself free and darted away, but not before the gleam of a street light had revealed his features to Carlos Moranza.

"The very fellow who tried to force his way into the quarters of the Junta!" he exclaimed, "and more than likely a Spanish spy. It is a narrow escape, my Carol, for if our blunder had not forced us to turn back, he must have discovered the Mermaid. In that case we should indeed have met with trouble."

"Let us hasten, then, before he returns."

"I don't believe he will dare do that. He is too badly scared."

But the spy did return, and, crouching in deepest shadow, became convinced that those whose business he was so anxious to discover had passed beneath the wharf. As he dared not attempt to follow them through the impenetrable gloom into which they had disappeared, he sought a hiding-place, and from it watched with infinite patience for them to again come forth.

They had, in the meantime, safely regained the snug living-room of the Mermaid, and reported all that had happened, to the Professor. Then Carl Baldwin unfolded his scheme for delaying the Spanish cruiser in port until after their departure.

As a result, the submarine boat was allowed to drift down the harbour with the ebbing tide, until she came abreast the great black hull of a man-of-war. Then she imperceptibly sank beneath the surface.

"She hovered like a gigantic fish."

The watch officer of the Spanish cruiser, leaning on her after-rail and gazing musingly down into the dark waters sweeping seaward, speculated idly concerning the stream of phosphorescent light tailing out from under her counter, but thought of it only as a natural phenomenon. Had he known that it was caused by the motion of the Mermaid's propeller necessary to hold her in position against the stream while she hovered like a gigantic fish directly above the screw of his ship, how easily could he have won the promotion for which he longed. But he suspected nothing; and as Carl Baldwin, working from the diving chamber of the submarine craft, had succeeded in fastening one end of a short length of stout wire rope to the propeller blade, and shackling the other to a ring-bolt in the massive rudder, the officer turned with a sigh and walked away.

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