A big schooner, was passing with all sails set, and, not long after this, a large steamer, bound up the Mississippi, hove into sight.
"Now, we'll get some big swells," remarked Sam, and he was right. Soon the houseboat began to rock in a fashion that pleased the boys, but alarmed the girls.
"When the houseboat rocks like that, I'm always afraid we'll be swamped," said Grace.
"There is little danger of that," said Captain Starr. "The wash would have to be much heavier before it could do any damage."
The morning passed pleasantly enough. The ladies spent the time over their fancy work, while the girls and boys read, played games and also sang and played. There was a piano on the Dora, and the boys had a guitar and a banjo along.
They were at dinner and discussing their next stopping place, when, without warning, there came a shock that threw Aleck flat on the floor, with a trayful of cup-custards over him.
"Fo' de lan' sake!" gasped the colored man. "Has we struck a stone wall?"
"Whow!" ejaculated Fred, who had had some hot coffee spilled on his knee. "This isn't pleasant, I can tell you."
Dick was already running on deck, and the others followed. They saw that Captain Starr's
