"I wonder what the captain and the two mates are talking about so seriously," Jack said as the three lads leant against the bulwarks in the shadow of the mainsail. "I expect they are wondering whether the pitch won't melt off her bottom," Jim Tucker said with a laugh; "or what will happen if all the crew are baked alive. I am sure it is pretty well as hot as an oven." "The sky looks rather a queer colour," Jack said, looking up. "You can hardly call it blue at all." "No, it is more like a dull gray than blue," Arthur Hill said. "Hallo! What is up, I wonder?" The captain had disappeared in his cabin, and on coming out had said a few words to Mr. Timmins, who at once went to the edge of the quarter-deck and shouted "all hands to shorten sail." The vessel was under a cloud of canvas, for every sail that could draw had been set upon her to make the most of the light puffs of wind. Some of the young seamen looked as if they could hardly believe their ears at the order; but Jack heard one of the older sailors say to a mate as they ran up the ratlines, "What did I tell you half an hour since, Bob: that like enough we should have scarce a rag on her by sunset." The lads sprang up the ratlines with the men, for they took their share of duty aloft. Arthur's place was in the mizzen, Jim's in the main, and Jack's in the fore-top. The stunsails were first got in, then the royals and topgallant-sails. The men were working well, but the captain's voice came up loud from the quarter-deck, "Work steady, lads, but work all you can! Every minute is of consequence!" Jack looked round the horizon, but could see nothing to account for this urgency. The sun was nearly overhead--a ball of glowing fire, and yet, Jack thought, less bright than usual, for he could look at it steadily, and its circle was clear and well defined. From that point right away down to the horizon the dull heavy-looking sky stretched away unbroken by a single cloud. As soon as the topgallant-sails were furled the upper spars were sent down, then the courses were clewed up and two of her jibs taken off her. "Close reef the topsails!" was the next order, and when this was done, and the men after more than an hour's work descended to the decks drenched with perspiration, the ship was under the easiest possible canvas--nothing but the three closely-reefed topsails, the fore-staysail, and a small jib. Mr. Hoare and the third mate had been aloft with the men, and as soon as all were on deck the work of coiling away ropes, ranging the light spars, and tidying up began. CHAPTER XVIII. A CYCLONE. "WHAT on earth is it all about?" Arthur Hill asked his comrades as the three boys gathered together after the work was done. "Why, there is not a breath of wind. Is it all done for practice, do you think?"