"Would there have been traces?"
"Yes and no—it would depend on circumstances."
"Hum. Now about the diamond ring belonging to Miss Langmore, which I gave you a short while ago to examine? Have you—ahem—examined it?"
"I have, and so has Doctor Soper. We used a magnifying glass and made several tests."
"Did you find anything unusual?"
"We did. In the first place two of the prongs which hold the diamond in place are bent out and up in such a fashion that each forms a sharp point. We next looked under the stone and found there a substance which both of us are convinced is a bit of dried-up blood."
"You are sure it is blood?"
"Yes. I can illustrate it scientifically, if you desire."
"It will not be necessary just now. When you say blood do you mean human blood?"
At this the young physician shrugged his shoulders.