A COMPLETE history of the subject which occupies these pages would fill an equal number of the ponderous folios over which our ancestors were accustomed to pore. The author of "Sketches of Imposture, Deception, and Credulity," aspires only to give, under various heads, a sample of the manifold frauds which have, in all ages, been successfully employed to frighten and gull mankind. His volume may be considered as a humble supplement to Sir Walter Scott's "Letters on Demonology and Witchcraft," and Sir David Brewster's "Letters on Natural Magic." If it should be found to afford to the Public only a quarter as much amusement and instruction as have been derived from those excellent works, his ambition will be amply gratified.