“I suppose if I had taken my twins home three months ago when Frank Birdsall died, you think I would have learned something about the needs and care of young persons by this time?” suggested the lawyer.

“Oh, I am sure you would have learned a great deal,” agreed Ruth, unable to suppress a smile.

“I wish I had!” groaned Mr. Howbridge.

The mystery of the disappearance of Ralph and Rowena Birdsall weighed on Mr. Howbridge’s mind continually. He did not often let the trouble come to the surface, however, being desirous of giving the young people with him a good time.

The surprise in store for them added zest to the enjoyment of the nice luncheon at the Culberton hotel. At half past two they all trooped out of the hotel, bags in hand, and instead of returning to the railway station, set off down the hill toward the docks.

“Are we going by steamer?” Agnes wanted to know. “Is there a channel open through the ice? I never did!”

“If there were two feet of ice on the Arlington Pond so that they could not drag it for the poor Birdsall twins,” Ruth said, “surely this lake must be frozen quite as thick.”

“But there’s a sailboat! I see one!” cried Tess, pointing between the buildings as they approached the waterfront.

“And there’s another,” said Sammy. “Oh, Je-ru-sa-lem! Looky, Aggie! That boat’s sailing on the ice!”

“Oh-ee!” squealed Agnes, clasping her hands and letting her bag fall to the ground. “Ice-boats! Neale! Are they really ice-boats?”