“Why not? Doctors must prepare for the worst.”

“Hope we shall have no worst, Doctor Instow,” said the captain, coming up. “If I could only get the signal that steam was ready! We are just swinging by the head to the buoyed cable, so that I can slip at any moment. Halloo! What’s going on now?” He ran forward, gave a word to the man in charge, and the beam of light swept round the yacht and back; but there was no fresh danger coming up, and the shouting and yelling which had taken the captain forward evidently proceeded from the two central canoes.

“Why, where’s the sunken one?” said Jack, as he shaded his eyes and peered forward.

“They’ve floated her right astern of them,” replied the captain, “half-an-hour ago, and the crew are distributed amongst the four. But I don’t quite make out what they were shouting about. Why— Steady there, my lads. You at the guns, be ready. The canoes are coming on. Oh!” he added to himself, “if there were only a capful of wind!”

But there was not a breath of air, as a loud yell from one voice was heard, and followed by a burst from the whole party. Then the paddles were plunged into the water on both sides, making it foam and sparkle in the bright light of the star, the canoes began to move very slowly, and Captain Bradleigh turned to the yacht’s owner—

“They mean mischief, sir. I’m afraid we must fire.”

“Only as a last resource,” said Sir John.

“If we wait for a last resource, sir,” said the captain sternly, “it may be too late. My lads could sink one of the canoes now, and that might check the advance. The guns are useless if we let them come to close quarters.”

“But I am dreadfully averse to what may prove wholesale slaughter,” said Sir John.

“So am I, sir,” said the captain dryly. “It is for you to decide.”