"Sure!"
Again the boys stared silently at each other, but there were traces of eager excitement on the faces of both.
"How are you going to find out what those marks mean, Frank?"
"That is a question easier asked than answered."
"Did you ever examine this stone under a microscope?"
"No."
"Then I advise you to do so without delay. These scratches are not very plain to the naked eye, but a microscope may reveal a great secret to you."
As Bart passed the ring back, Frank said:
"You are right. My curiosity is thoroughly aroused, and I will examine it under a magnifying glass at the earliest opportunity."
"Get leave to look at it under the big glass in the experimenting room."