THE PROFESSOR EXPLAINS.
Syme's heart turned to stone, but his face never changed.
"Your suggestion is ridiculous," he began. "Why on earth——"
The old man struck his palsied hand passionately on the rickety table, nearly breaking it.
"Did you hear me ask a plain question, you pattering spy?" he shrieked in a high, crazy voice. "Are you, or are you not, a police detective?"
"No!" answered Syme, like a man standing on the hangman's drop.
"You swear it," said the old man, leaning across to him, his dead face becoming as it were loathsomely alive. "You swear it! You swear it! If you swear falsely, will you be damned? Will you be sure that the devil dances at your funeral? Will you see that the nightmare sits on your grave? Will there really be no mistake? You are an anarchist, you are a dynamiter! Above all, you are not in any sense a detective? You are not in the British police?"
He leant his angular elbow far across the table,
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