That which the former fireman saw was a number of sparks mingling with the heavy vapor that was beginning to tumble out of the smokestack. The next moment both saw that the craft was heading out into the river.

“General Yozarro and his officers have returned!” called Martella; “the firemen are cramming the furnace with wood; they mean to pursue us!”

Jack Starland and his sister looked behind them. The Atlamalcan had spoken the truth. The time seemed much too short for the party to have made the journey to the Castle and back. In fact, it was impossible for them to have done so, but there could be no doubt that they were all on the tugboat. The explanation instantly flashed upon Martella.

“Captain Navarro suspected the truth some time after we left and hurried to take us to the Castle again. Some news may have reached him, or his own sense told him of my trick. He met the General on the way.”

Such undoubtedly was the fact. Had our friends suspected aught of that nature, they would not have frittered away the precious minutes as they had done.

Meanwhile, the resinous wood flung into the furnace of the tugboat was doing its work. From the single smokestack poured the murky vapor, sprinkled with crimson sparks which were tossed right and left high in air, to drop hissing into the water. In the moonlight, a snowy winrow at the bow showed that the tug was plowing ahead with fast increasing speed. Capable of making a dozen miles an hour, she was already doing her best, and coming up with the sailboat hand over hand.

Only a few minutes were given the fugitives in which to decide what to do. A straight away race was hopeless, for the pursuer, now no more than an eighth of a mile distant, was sure to overhaul them in a very brief time.

“I am inclined to let General Yozarro come up with us,” said the Major; “I have no fear of his molesting me or Miss Starland, and I am rather curious to hear what he has to say for himself. We are in our own boat, or at least not in his, and we have committed no crime against the Atlamalcan Republic, whatever that name means.”

“You must not think for an instant of such a thing,” said his sister with great earnestness.

“Why not? Do you hold him in fear?”