A brief survey of some of the plays produced in the last few years, most of them being seen in New York, will illustrate the extent to which the ghostly motifs are used on the stage of to-day. Double personality is represented[227] by Edward Locke, in a play which is said by critics to be virtually a dramatization of Dr. Morton Prince's study,[228] where psychological apparatus used in laboratory experiments to expel the evil intruder from the girl, a chronoscope, a dynograph, revolving mirrors, make the setting seem truly psychical. But the most dramatic instance of the kind, of course, is the dramatization of Dr. Jekyll's alter ego. [227] In _The Case of Becky_. [228] _The Disassociation of a Personality._ The plays of Charles Rann Kennedy[229] and Jerome K. Jerome[230] are akin to the old mystery plays in that they personate divinity and show the miracle of Christly influence on sinful hearts. Augustus Thomas[231] and Edward Milton Royle[232] introduce hypnotism as the basis of complication and denouement. Supernatural healing, miraculous intervention of divine power, occur in plays by William Vaughan Moody,[233] Björnson,[234] and George M. Cohan.[235] Another[236] turns on converse with spirits, as does Belasco's _Return of Peter Grimm_, while a war play by Vida Sutton[237] shows four ghosts on the stage at once, astonishing phantoms who do not realize that they are dead. Others[238] have for their themes miracles of faith and rescue from danger, though the first-named play satirizes such belief and the latter is a piece of Catholic propaganda. [229] _The Servant in the House._ [230] _The Passing of the Third Floor Back._ [231] In _The Witching Hour_. [232] In _The Unwritten Law_. [233] _The Faith Healer._ [234] _Beyond Their Strength._ [235] _The Miracle Man._ [236] _The Spiritualist._ [237] _Kingdom Come._ [238] As _The Eternal Mystery_, by George Jean Nathan, and _The Rosary_. _Magic_, by G. K. Chesterton, introduces supernatural forces whereby strange things are made to happen, such as the changing of the electric light from green to blue. _Peter Ibbetson_, the dramatization of Du Maurier's novel, shows dream-supernaturalism, and various other psychic effects in a delicate and distinctive manner. And _The Willow Tree_, by Benrimo and Harrison Rhodes, is built upon an ancient Japanese legend, relating a hamadryad myth with other supermortal phantasies, such as representing a woman's soul as contained in a mirror.