“Just give us time and we’ll make it,” Danny declared. Ah, yes, there was the rub. All too soon the bugle would blow and they would be scattered far and wide to new fields of endeavor.

They made some progress. One evening Danny exclaimed: “See here! The numbers they are sending—if they are numbers—are all odd. Seven, seventeen, thirty-one, forty-three. There’s not an even number in the lot.”

“That narrows it down,” said Sally.

“It sure does.”

Two evenings later Sally made a more important discovery.

“Look!” She jumped to her feet in her excitement, to point at a row of numbers. “Not one of them is evenly divisible. Seven, seventeen, thirty-seven, fifty-three, every last one of them. Does that mean anything?”

“It may mean a lot,” was Danny’s excited comment.

“Oh, there’s the bell!” she exclaimed. “Time for class. Think of dropping this discovery just like that.”

“It’s not dropped.”

Danny dragged out a tall stack of papers. “I’ll still be working on that when you’re fast asleep.”

“Danny, you’re a treasure!” she exclaimed, giving his hand a quick squeeze.

“It’s all part of the game,” he grinned. “We’ll be famous, both of us, and your old friend C. K., as well.”

The hour was striking midnight when at last Danny stacked the papers in a neat pile.

“Got it!” he breathed. “It’s the berries. Can’t be any mistake about that. We’re really making progress. But we’ve still got a long way to go.”

That very night one more major problem brought Sally’s radio experimentation to an abrupt halt.

She returned to her room, after her late hour of study, to find Barbara sitting in her bed staring gloomily at the floor.

“What’s the matter?” she asked. “Been caught out of bounds, or something?”

“I haven’t done a thing,” Barbara replied gloomily. “Perhaps it would be better if I did. When you never step off the beaten path, just plug along day by day, people ask you to do such terrible things.”

“Why? What have they asked you to do now?”

“It’s that 

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