of the wall—the one who could see, or the blind man?"
The amazed Justice struck the table with his clenched hand.
"By the gods," he cried, "not the blind man! For to the blind man, the passage was always dark!"
The lawyer had not moved, but his face, in its desperate perplexity, began to sweat. The Justice swung around upon him, but Abner put out his hand.
"A moment, Randolph," he said. "The human body is a curious structure. It has two sides, as though two similar mechanisms were joined with a central trunk—the dexter side, or that which is toward the south when the man is facing the rising sun, and the sinister side, or that which is toward the north. These sides are not coequal. One of them is controlling and dominates the man, and when the task before him is difficult, it is with this more efficient controlling side that he approaches it.
"Thus, one set on murder and desperately anxious to make no sound, to make no false step, to strike no turn or angle, would instinctively follow the side of the wall that he could feel along with his controlling hand. This passage runs north and south. The bloody finger-prints are all on the west side of the wall, the prints in the dust on the east side; therefore, the assassin followed the east side of the wall when he set out on his deadly errand, and the west side when he returned with the blood on him.
"That is to say," and his voice lifted into a
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