"I find two errors."
"Ah, let me see."
The lad handed his employer a long bill that had been placed on his desk for examination.
"Here is an error of ten dollars in the calculation which they have made against themselves; and another of ten dollars in the footing."
"Also against themselves?"
"Yes, sir."
The merchant smiled in a way that struck the lad as peculiar.
"Twenty dollars against themselves," he remarked in a kind of pleased surprise; "trusty clerks they must have!"
"Shall I correct the figures?" asked the lad.
"No; let them correct their own mistakes. We don't examine bill's for other people's benefit," replied the merchant. "It will be time to correct those errors when they find them out. All so much gain as it now stands."