particularly he insisted on all of them learning how to tie a boat
properly so it could not slip away.

Betty already knew this, and Mollie had a fairly good notion of it,
but Grace admitted that, all along, she had been making a certain
wrong turn which would cause the knot to slip under strain.

They motored down the river again, stopping at a small town to enable
Mollie to go ashore and telephone home to learn the condition of
little Dodo. There was nothing new to report, for the operation would
not take place for some time yet.

Grace also called up to ask if anything had been heard of the missing
horse and papers, but there was no good news. However, there was no
bad news, Will, who talked to his sister, reporting that the interests
opposed to their father had made no move to take advantage of the
non-production of the documents.

"Have a good time, Sis," called Will over the wire. "Don't worry. It
doesn't do any good, and it will spoil your cruise. Something may turn
up any time. But it sure is queer how Prince can be away so long."

"It certainly is," agreed Grace.

"And so you expect to make Rainbow Lake by six bells?" asked Betty's
uncle, as he paced up and down the rather restricted quarters of the
deck.

"Yes, Uncle, by seven o'clock," answered Betty, who was at the wheel.
"Six bells-- six bells!" he exclaimed. "You must talk sea lingo on a