“I wonder what this is for?” he said.
“Looks as if it was meant to lift the stone up by,” replied Jerry.
“Give us a hand,” said Ned, “and we’ll see what’s here.”
The two boys pulled and tugged, but could not budge the stone. The professor happened along and saw them.
“I’ll show you how to do it,” he said.
He took a long pole and thrust it through the ring. Then, using the pole as a lever, he easily raised the stone.
“Now let’s see what we have unearthed,” he remarked.
The stone had covered a small hole. In it was a little casket of lead, the lid of which was locked.
“We’ll have to break it open,” said Jerry.