The scholar stared. “The Citizen in the morning, The Register in the evening.”

“Are either of them delivered to your laboratory?”

“Yes; the Register.”

“Do you keep it on file?”

“No.”

“Ah! That’s a pity. Then you wouldn’t know if one were missing?”

The professor reflected. “Yes, there was a copy containing a letter upon Von Studeborg’s recent experiments—”

“Can you recall the date?”

“After the middle of June, I think.”

Average Jones sent for a file and handed it to Professor Gehren.