It is, I confess, with considerable diffidence that I approach the strange narrative which I am about to relate. The events which I purpose detailing are of so extraordinary and unheard-of a character that I am quite prepared to meet with an unusual amount of incredulity and scorn. I accept all such beforehand. I have, I trust, the literary courage to face unbelief. I have, after mature consideration, resolved to narrate, in as simple and straightforward a manner as I can compass, some facts that passed under my observation in the month of July last, and which, in the annals of the mysteries of physical science, are wholly unparalleled. I live at No. -- Twenty-sixth Street, in this city. The house is in some respects a curious one. It has enjoyed for the last two years the reputation of being haunted. It is a large and stately residence, surrounded by what was once a garden, but which is now only a green enclosure used for bleaching clothes. The dry basin of what has been a fountain, and a few fruit-trees, ragged and unpruned, indicate that this spot, in past days, was a pleasant, shady retreat, filled with fruits and flowers and the sweet murmur of waters. The house is very spacious. A hall of noble size leads to a vast spiral staircase winding through its centre, while the various apartments are of imposing dimensions. It was built some fifteen or twenty years since by Mr. A----, the well-known New York merchant, who five years ago threw the commercial world into convulsions by a stupendous bank fraud. Mr. A----, as every one knows, escaped to Europe, and died not long after of a broken heart. Almost immediately after the news of his decease reached this country, and was verified, the report spread in Twenty-sixth Street that No. -- was haunted. Legal measures had dispossessed the widow of its former owner, and it was inhabited merely by a care-taker and his wife, placed there by the house-agent into whose hands it had passed for purposes of renting or sale. These people declared that they were troubled with unnatural noises. Doors were opened without any visible agency. The remnants of furniture scattered through the various rooms were, during the night, piled one upon the other by unknown hands. Invisible feet passed up and down the stairs in broad daylight, accompanied by the rustle of unseen silk dresses, and the gliding of viewless hands along the massive balusters. The care-taker and his wife declared they would live there no longer. The house-agent laughed, dismissed them, and put others in their place. The noises and supernatural manifestations continued. The neighborhood caught up the story, and the house remained untenanted for three years. Several persons negotiated for it; but somehow, always before the bargain was closed, they heard the unpleasant rumors, and declined to treat any further.