“I’ve got something here that I want you to look at.”

“Let’s see it.”

Nick took out the paper that was spotted with blood.

This he quietly handed to the professor, saying:

“Take a look at that through the microscope.”

“Blood? What do you want to know?”

“I want to know if you can say positively what animal’s blood that is?”

“Animal’s blood?”

“Yes.”

“You don’t suspect it of being human blood?”