“We haven’t decided on the dimensions. I want to make a plan of her first,” Dan said, seriously.

“Well, now! let me tell you one thing,” said the decisive Lettie. “You have got to build it big enough to carry four—hasn’t he, Mildred?”

“Four what?” demanded Billy.

“Four people, of course. You’re not going to be stingy, Billy Speedwell! You know our mothers wouldn’t hear of our sailing an iceboat; but if you boys take us——”

“Ho!” cried Billy. “You don’t know what you’re talking about, Let!”

“There isn’t any place you go, Billy Speedwell, that I can’t!” cried the red-haired one, who had always been something of a tomboy. “And I’m not afraid to do anything that you dare to do—so there!”

“Dear me, Lettie don’t get so excited,” advised Mildred. “Do you suppose girls could sail on your iceboat, Dan?”

“Why not? An iceboat is no more dangerous than a sailboat. And I intend to build our boat with a shallow box on the body so that at least two passengers can lie down in it comfortably.”

“Lie down in it?” queried Lettie, in a puzzled tone.

“Of course,” grunted Billy, “or the boom would knock their silly heads off when the boat comes about. Don’t you know?”