"I've taken it only once or twice before."
"Then I don't wonder that your memory is not quite clear. But tell me what you can of your movements. I want to follow your actions from the time you left the house."
He leaned forward, one elbow resting on the table between us, and fixed his eyes with anxious intentness on a crack in the floor.
"I went down to the Phœnix Building--"
"Did you walk?"
He hesitated a moment. "Yes."
"Go on."
"I went up to Barker's office on the second floor,--"
"How did you know that it was his office? Excuse my interrupting, but I want to follow all the details. Barker's name wasn't on the door."
"I don't remember how I knew. Perhaps I asked somebody."