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the means of placing that cryptogram in his hands, owing to one of those odd chances that arise again and again in real life—are, indeed, so common as to pass almost unregarded—and yet might be thought improbable if offered in the guise of a mere story. Hewitt has often alluded to the curious persistence of such chances in his experience. I think I have elsewhere mentioned a certain police officer's prolonged search after a criminal for whose arrest he held a warrant, ending in the discovery—because of a misdirected call—that the man had been living all the time next door to himself; and I have also told of the other detective inspector, who, being sent in search of a criminal of whom he had but the meagrest and most unsatisfactory particulars, and whom he scarcely hoped ever to run down, actually fell over the man as he was leaving the office where he had received his information, in the doorway of which the fellow had stooped to tie his shoe-lace! But, as Hewitt would say, nothing but the exceptional nature of the surrounding circumstances makes these things seem extraordinary. What more ordinary experience, for example, than to meet a friend in some London street—perhaps one friend of the only dozen or so you have among the four millions of people about you? The odds against you two, of all the millions, choosing the