Under Bill's tutelage, Evan had dropped the "sir" when speaking to Castle.

"Remember, the interest has to be computed this month. Watson, it will be up to you to check it."

"I'm not the accountant," said Bill, chewing gum with a smacking noise. "I'll help him make it up, though."

Mr. Robb came to the cage door for some change, and the teller referred the matter to him.

"Oh, do your best with it, boys," he said. "I'm strong for co-operation. There isn't enough of it among the staff."

Castle turned away with a sneer.

"I've got the liability," he said, sulkingly.

"I'll take charge of that this time," returned Robb; "give the boys a hand at the savings, Alf. And say, Watson, get the cash book written up early so that I can post the general, will you?"

"All right, sir," said Bill, cheerily.

Evan experienced a thrill as these orders were passed around. He felt that he was part of a great system. The names of ledgers and balance-books sounded pleasant to him, for he was daily learning considerable about them. Their puzzles were solving and their mysteries dissolving before his constant gaze. He felt like an engineer lately on the job, or a new chauffeur, only more mighty.