"I observed Señor de Sanchez turn in at the entrance."
"What direction was he going when you first observed him?"
"West—toward me."
"Very well; proceed, Mr. Lynden."
"I continued on to the doorway, where I turned into the Nettleton Building, going directly upstairs without pausing."
"Did you see Señor de Sanchez?"
"Yes. Just as I began ascending the stairs he was turning to the right—to the east—at the top. There was a lighted incandescent lamp at that point, and I beheld him distinctly."
"Do you know what time that was?"
"It could have been only two or three seconds to five o'clock, for I heard the whistles begin to blow before I reached the top of the stairs."
"You are sure it was before you arrived at the top that you heard the whistles blow?"