Some one must have notified The Cid at about the same time, for he came from his cabin and looked long and searchingly at the heavens.

In his loud voice The Cid bellowed commands and his wild crew scrambled to their stations like monkeys, swarming aloft or standing by on deck ready to do his bidding.

Down came the great sails and reefed were the lesser ones, and throughout the fleet, scattered over the surface of the shining sea, the example of the Commander was followed.

The cloud was increasing in size and coming rapidly nearer. No longer was it the small white cloud that had first attracted their attention, but a great, bulging, ominous, black mass that frowned down upon the ocean, turning it a sullen gray where the shadow lay.

The wind that had been blowing gently ceased suddenly. The ship fell off and rolled in the trough of the sea. The silence that followed cast a spell of terror over the ship’s company.

Tanar, watching, saw the change. If these rough seafaring men blenched before the threat of the great cloud the danger must be great indeed.

The Sarians were mountain people. Tanar knew little of the sea, but if Tanar feared anything on Pellucidar it was the sea. The sight, therefore, of these savage Korsar sailors cringing in terror was far from reassuring.

Someone had come to the rail and was standing at his side.

“When that has passed,” said a voice, “there will be fewer ships in the fleet of Korsar and fewer men to go home to their women.”

He turned and saw Stellara looking upward at the cloud.