"Is that so?" was the grumbling reply. "By the manner in which you gave the alarm, I thought you had sighted a suspicious sail, and my heart leapt into my mouth at your shout. But it is well that there is nothing in it. Go to your places now, and do not forget to keep constant watch."

For a minute he stood by the bulwark, while Jim and his companion went forward and threw themselves upon the deck. Then he retired to the stern of the vessel, and sat down in the shade cast by the enormous sail.

For three hours the dhow kept steadily on her course, and then Jim, who lay upon the starboard side, suddenly caught sight of a speck of white coming from the opposite direction. Keeping his eyes fixed upon it, he noticed that it increased rapidly in size, and soon there was no doubt that it was another vessel. Giving a low cough to attract Tom's attention, he pointed towards the object, and then sprang to his feet. Walking along the deck, he approached the group at the farther end, and laid his hand upon the shoulder of the master, shaking him as he did so, for he had fallen asleep.

In a moment all were on their feet, and staring across the sea.

"It is a large dhow," said the man who commanded the crew, "and she is sweeping down in our direction. What do you think she is?"

"It is too early to say," answered one of the men, "but she is not a trader—of that I am sure—nor does she belong to the Government. It is possible that she comes from some African port, but until she is closer I cannot be certain. This I can say, she is larger than any dhow plying between Aden and the opposite coast, and therefore we shall do well to keep her at a distance."

For a few minutes the natives held a heated conversation, and a sharp order was given to alter the course. When that was done, and the dhow was holding along in a southerly direction, the crew gathered in the bows and stood there, gazing anxiously at the distant vessel. Cries of alarm escaped their lips when they noticed that her head came round, and that she, too, had altered her course so as to intercept them.

"She sails faster than we do!" exclaimed the master, with an oath. "We cannot hope to escape her, and therefore I advise that we resume our course, and make ready for an encounter, though it is more than likely that she will prove to be a friend. And if not that—well, we must prepare to sell our lives dearly. But I cannot believe that we have anything to fear, for none but peaceful traders sail upon this sea."

"That is so," agreed one of the crew. "But I have heard that, at times, piratical craft sail from the coast of Africa, and swoop down upon the traders. If that dhow is bent upon such an expedition, we are lost, for her owners care no more for the Mullah than they do for other people."

The news filled his companions with dismay. In a half-hearted manner they produced a number of guns from the hold, and proceeded to load them. Then they placed swords beside the bulwark, and motioned to Jim and Tom to select a couple.