While much has been written in France and Italy concerning the remarkable woman who forms the subject of this book, but little has appeared either in England or America - with the exception of M. Flammarion's work, Mysterious Psychic Forces, and a series of articles that have appeared from time to time in the English edition of the Annals of Psychical Science. Yet the case is one of the most remarkable that has come to the attention of the scientific world for many years - since we are concerned, apparently, with movements of physical objects without contact, and even far more startling phenomena - contrary to the known laws of physics and physiology.<br><br>In the following book I propose to lay before the reader a summary of all the historic evidence available, together with a detailed record of our own experiments with this medium, conducted in Naples, in November and December, 1908; a complete resume of every theory that has been advanced to date - with a provisional hypothesis of my own; and then to discuss at some length the biological and psychological peculiarities of the case - from the point of view of one who assumes, on the strength of the existing testimony, that the facts are established.<br><br>One forms a very different opinion of Eusapia's seances before and after he has obtained personal sittings.