A critical, seminal work examining mediumistic phenomena, particularly those of Eusapia Paladino. As a psychiatrist, Morselli proposed a "psychodynamic" theory of materialization, attempting to bridge scientific psychology with the spiritual phenomena of his time, often favoring an explanation based on hidden human faculties rather than purely external spirits. Two volumes in later blue cloth bindings with gilt titles to spines. Original spine strips are loosely inserted having been laid down to a piece of card. Recent endpapers. Original illustrated covers bound in. Pages collate as complete with a total of 18 plates, as called for, plus numerous illustrations throughout. Age toning and a few little marks here and there, otherwise pages are generally clean as shown. Page edges are slightly brittle in places. Pages: Vol. I - xlviii, 464pp, [2], 7 plates Vol. II - xviii, 586pp, 11 plates Weight: 2kg