“True; and you will remember an expression attributed almost unanimously, by the evidence, to this voice, — the expression, ’mon Dieu!’ This, under the circumstances, has been justly characterized by one of the witnesses (Montani, the confectioner,) as an expression of remonstrance or expostulation.  Upon these two words, therefore, I have mainly built my hopes of a full solution of the riddle.  A Frenchman was cognizant of the murder.  It is possible — indeed it is far more than probable — that he was innocent of all participation in the bloody transactions which took place.  The Ourang-Outang may have escaped from him.  He may have traced it to the chamber; but, under the agitating circumstances which ensued, he could never have re-captured it.  It is still at large.  I will not pursue these guesses - for I have no right to call them more — since the shades of reflection upon which they are based are scarcely of sufficient depth to be appreciable by my own intellect, and since I could not pretend to make them intelligible to the understanding of another.  We will call them guesses then, and speak of them as such.  If the Frenchman in question is indeed, as I suppose, innocent of this atrocity, this advertisement which I left last night, upon our return home, at the office of ‘Le Monde,’ (a paper devoted to the shipping interest, and much sought by sailors,) will bring him to our residence.”

He handed me a paper, and I read thus: 

CAUGHT — In the Bois de Boulogne, early in the morning of the — inst., (the morning of the murder,) a very large, tawny Ourang-Outang of the Bornese species.  The owner, (who is ascertained to be a sailor, belonging to a Maltese vessel,) may have the animal again, upon identifying it satisfactorily, and paying a few charges arising from its capture and keeping.  Call at No. ——­ , Rue ——­, Faubourg St. Germain — au troisiême.

“How was it possible,” I asked, “that you should know the man to be a sailor, and belonging to a Maltese vessel?”

“I do not know it,” said Dupin.  “I am not sure of it.  Here, however, is a small piece of ribbon, which from its form, and from its greasy appearance, has evidently been used in tying the hair in one of those long queues of which sailors are so fond.  Moreover, this knot is one which few besides sailors can tie, and is peculiar to the Maltese.  I picked the ribbon up at the foot of the lightning-rod.  It could not have belonged to either of the deceased.  Now if, after all, I am wrong in my induction from this ribbon, that the Frenchman was a sailor belonging to a Maltese vessel, still I can have done no harm in saying what I did in the advertisement.  If I am in error, he will merely suppose that I have been misled by some circumstance into which he will not take the trouble to inquire.  But if I am right, a great point is gained.  Cognizant although innocent of the murder, the Frenchman will naturally