Rattleton came up to Merriwell with the box of loaded shells.
"They are not all just alike, Merry!" he declared.

"I have been looking them over.

See!" He took up three of the shells and exhibited them to Frank.

A casual glance would show no difference between them and the other shells in the box.

But a close inspection showed that the brass did not go up quite so high on the paper.
"I am sure that all the shells in the box were just alike," said Merry.
"Those were slipped in there.