“That is common,” said the bored man, wearily. “Scar of a cut or a scratch, usually”—and he took the strip of glass indifferently, and raised it toward the lamp.

All the blood sunk suddenly out of his face; his hand quaked, and he gazed at the polished surface before him with the glassy stare of a corpse.

“Great Heavens, what’s the matter with you, Wilson? Are you going to faint?”

Tom sprang for a glass of water and offered it, but Wilson shrank shuddering from him and said—

“No, no!—take it away!” His breast was rising and falling, and he moved his head about in a dull and wandering way, like a person who had been stunned. Presently he said, “I shall feel better when I get to bed; I have been overwrought to-day; yes, and over worked for many days.”

“Then I’ll leave you and let you to get to your rest. Good-night, old man.” But as Tom went out he couldn’t deny himself a small parting gibe: “Don’t take it so hard; a body can’t win every time; you’ll hang somebody yet.”

Wilson muttered to himself, “It is no lie to say I am sorry I have to begin with you, miserable dog though you are!”

He braced himself up with a glass of cold whisky, and went to work again. He did not compare the new finger-marks unintentionally left by Tom a few minutes before on Roxy’s glass with the tracings of the marks left on the knife-handle, there being no need for that (for his trained eye), but busied himself with another matter, muttering from time to time, “Idiot that I was!—Nothing but a girl would do me—a man in girl’s clothes never occurred to me.” First, he hunted out the plate containing the finger-prints made by Tom when he was twelve years old, and laid it by itself; then he brought forth the marks made by Tom’s baby fingers when he was a suckling of seven months, and placed these two plates with the one containing this subject’s newly (and unconsciously) made record.

“Now the series is complete,” he said with satisfaction, and sat down to inspect these things and enjoy them.

But his enjoyment was brief. He stared a considerable time at the three strips, and seemed stupefied with astonishment. At last he put them down and said, “I can’t make it out at all—hang it, the baby’s don’t tally with the others!”