"But never mind," he went on to Nellie, in a whisper.

"Just you wait and see the diamond ring I get you one of these days." And this remark made Nellie blush as deeply as had Dora.

Sam said something, too, to Grace about a ring, at which she laughed merrily and slapped his face.

But when the boys were in the biplane and ready to sail away, and he held up a finger with a ring on it and looked at her questioningly--and longingly--she gave a quick little nod of her curly head.
[Illustration: "OH, DICK, A DIAMOND RING!" SHE CRIED .-- _Page_ 161.] "All ready ?" asked Dick, at last.
"All ready!" replied his brothers.
"Then start her up!" cried the oldest Rover boy, and the others gave a turn to the propellers.

Bang! bang! bang! went the engine, and Sam and Tom rushed to their seats.
"Come again soon!" cried the girls.
"Just as soon as we can!" was the answer.
"Be careful!" pleaded Dora.