The extraordinary scene I had witnessed engaged my attention during the evening, but all my efforts at clearing up the mystery that enveloped the proceedings of these individuals were met by difficulties which for a time seemed insuperable. I sat cogitating and recogitating various theories and probabilities, and had several times examined the iron powder, which, for better observation, I had scattered on a sheet of white paper that lay on my table. My intention was to test it, and I waited the incoming of my assistant to aid me in my experiment. As I looked at it at intervals between my trains of thought, I was struck with a kind of glittering appearance it exhibited, and which was more observable when it caught my eye obliquely and collaterally, during the partial suspension of my perception by my cogitations. Roused by this circumstance, I proceeded instantly to a more minute investigation; and having, by means of a magnet, removed all the particles of iron, what was my surprise to find a residuum of triturated glass--one of the most searching and insidious poisons known in toxicology. Good God! what were my thoughts and feelings when the first flash of this discovery flared upon my mind--solving, in an instant, by the intensity of its painful light, all my doubts, and realizing all my suspicions. Every circumstance of this mysterious affair stood now revealed in clear relief--a dark scheme of murder, more revolting in its features than any recorded in the malefactor's journal, was illumined and exposed by a light which exhibited not only the workings of the design itself, but the reason which led to its perpetration. This man had married the confiding and devoted foreigner for the sake of her immense wealth, which raised him in an instant from mediocrity to magnificence; and, having attained the object of his ambition, he had resolved--with a view to the concealment of the means whereby he effected his purpose, and regardless of the sacred obligation of gratitude he owed to her who had left her country, her relations, and friends, to trust herself to his protection and love--to immolate the faithful, kind-hearted, and affectionate creature, by a cruel and protracted murder. In her own country the cowardly wretch could not have braved the vengeance of her countrymen; but, in a distant land, where few might be expected to stand up for the rights of the injured foreigner, he had thought he might execute his scheme with secrecy and success. But now it was discovered! By one of those extraordinary detached traces of the finger of the Almighty, exposed to the convicting power of divine intellect, it was discovered!