“Six o’clock—sometimes earlier, sometimes later.” The man spoke in a surly monotone. He was obviously resentful at this unexpected intrusion upon his orderly routine.

“And what time do you get here in the morning?”

“Eight o’clock, regular.”

“What time did you go home last night?”

“About six—maybe quarter past.”

Heath paused and finally lighted the cigar on which he had been chewing at intervals during the past hour.

“Now, tell me about that side door,” he went on, with undiminished aggressiveness. “You told me you lock it every night before you leave—is that right?”

Ja—that’s right.” The man nodded his head affirmatively several times. “Only I don’t lock it—I bolt it.”

“All right, you bolt it, then.” As Heath talked his cigar bobbed up and down between his lips: smoke and words came simultaneously from his mouth. “And last night you bolted it as usual about six o’clock?”

“Maybe a quarter past,” the janitor amended, with Germanic precision.