Mrs. Culver, a relative of the Fox girls, made a solemn deposition before a magistrate, to the effect that one of the girls had instructed her how to produce the "raps," on condition that she (Mrs. C.) should not communicate a knowledge of the matter to any one. Mrs. Culver was a good Christian woman, and she felt it her duty--as the deception had been carried so far--to expose the matter. She actually produced the "raps," in presence of the magistrate, and explained the manner of making them. Doctor Von Vleck--to whom I referred in connection with my exposition of the Davenport imposture--produces very loud "raps" before his audiences, and so modulates them that they will seem to be at any desired point in his vicinity; yet not a movement of his body betrays the fact that the sounds are caused by him. The Fox family found that the rapping business would be made to pay; and so they continued it, with varying success, for a number of years, making New York city their place of residence and principal field of operation. I believe that none of them are now in the "spiritual line." Margaret Fox, the youngest of the rappers, has for some time been a member of the Roman Catholic Church. From the very commencement of spiritualism, there has been a constantly increasing demand for "spiritual" wonders, to meet which numerous "mediums" have been "developed." Many, who otherwise would not be in the least distinguished, have become "mediums" in order to obtain notoriety, if nothing more. Communicating by "raps" was a slow process; so some of the mediums took to writing spasmodically; others talked in a "trance"--all under the influence of spirits! Mediumship has come to be a profession steadily pursued by quite a number of persons, who get their living by it. There are various classes of "mediums," the operations of each class being confined to a particular department of "spiritual" humbuggery. Some call themselves "test mediums;" and, by insisting upon certain formulas, they succeed in astonishing, if they don't convince most of them who visit them. It is by this class that the public is most likely to be deceived.