Clifford's face was a study as his partner thus aired his nautical opinions, while Johnny Peltsman greeted the remark with open-mouthed astonishment; and when Jack concluded his observations, Johnny said earnestly: "By the way, young friend, it is understood, of course, that if you sink or wreck the Slug, you must pay damages." "Certainly, if we lose the yacht, you shall be paid for it," Jack answered, feeling rather indignant at the suggestion. [Illustration: THE BOYS ENGAGE THE "SLUG."] Being directed to the place where the Slug lay, the boys hastened away to take immediate possession. Johnny stood looking after them until they were out of sight. Then turning to enter his shop, he soliloquized: "Well, that beats all! The idea of hiring a boat without seeing it, and not caring to have it to sail close to the wind! I suppose, of course, those chaps can swim." And with an ominous shake of the head, Johnny resumed his carriage-making. Our heroes found their prize lying in a little cove just above the bridge. The Slug was a flat-bottomed center-board boat, fifteen feet long, five feet across the stern, and narrowing gradually to a point at the bows. A more clumsy sail-boat was never seen. But Jack only noticed the two large lockers, and with unbounded satisfaction, remarked to his cousin: "We can stow away a big stock of provisions in those boxes, Cliff." It was Friday, so the two boys decided to give the "yacht" a short trial-trip down to the Highlands and back. In that way they would become familiar with the boat, and on Monday morning would be ready to start on a week's cruise. It chanced that a flood-tide was just beginning when the lads shoved the Slug well out into the river, while the wind was blowing a brisk gale straight down-stream, the very direction in which the boys wished to go. Clifford was enough of a sailor to step the little mast and properly set the leg-of-mutton sail for a breeze directly astern. With a strong wind behind her, and only a weak tide opposing, it was not surprising that the Slug made a progress quite satisfactory to the two amateur yachtsmen. As the tide increased in force, however, the boat went slower and slower, and it was six o'clock when the Highlands "hove in sight," as Jack said--having learned that and other nautical terms from his story-books. On finding how late it was, Clifford remarked: "We'd better be making for home." The boys managed to put the Slug about, and very soon Jack ascertained that there were times when it was an advantage to have a boat able to sail close to the wind; for, as the breeze still blew down-stream, Clifford found it simply impossible to beat up the river in the Slug. The truth was, the only "proper conditions" under which Johnny Peltsman's boat would sail at all were those of going straight before the wind! [Illustration: "'HOW CAN YOU SLEEP?' ASKED CLIFFORD."]