Barry Pain's _The Love Philter_ is related both to the old and the new types of supernatural chemistry. A man loves a woman who doesn't care, so he asks aid of a wise woman, who gives him a potion that will surely win the stubborn heart. As he lies asleep in the desert, on his way back, he dreams that his love says to him that love gained by such means is not love, so he pours the liquid on the sand. When he returns, the woman tells him that she has been with him in his dreams and loves him because he would not claim her wrongly. _Blue Roses_ is another of his stories of magic that bring love to the indifferent. _Twilight_, by Frank Danby, is a novel based on the relation between morphia and the supernatural. A woman ill of nervous trouble, under the influence of opiates, continually sees the spirit of a woman dead for years, who relives her story before her eyes, so that the personalities are curiously merged. This inevitably suggests De Quincey's _Confessions of an English Opium-Eater_ with its dream-wonders, yet it has a power of its own and the skillful blending of reality with dream-supernaturalism and insanity has an uncanny distinction. Fu-Manchu, the Chinese wonder-worker in Sax Rohmer's series of stories bearing that name, is a representative example of the modern use of chemistry for supernormal effect. He employs all the forces of up-to-the-minute science to compass his diabolic ends and works miracles of chemistry by seemingly natural methods. By a hypodermic injection he can instantly drive a man to acute insanity incurable save by a counter-injection which only Fu-Manchu can give, but which as instantly restores the reason. By another needle he can cause a person to die--to all intents and purposes, at least,--and after the body has been buried for days he can restore it to life by another prick of the needle. He terrorizes England by his infernal powers, killing off or converting to slavery the leading intelligences that oppose him. Stevenson's _Dr. Jekyll and Mr. Hyde_ is perhaps the best-known instance of chemical supernaturalism. Here the magic drug not only changes the body, evolving from the respectable Dr. Jekyll his baser self in the form of Mr. Hyde, enabling him to give rein to his criminal instincts without bringing reproach on his reputation, but has the subtle power to fix the personality of evil, so that each time the drug is used Hyde is given a stronger force and Jekyll is weakened. This fictive sermon on dual nature, the ascendence of evil over the nobler soul if it be indulged, seems yet an appallingly real story of human life. In a similar fashion Arthur Machen uses supernatural chemistry most hideously in _The Three Impostors_, where a certain powder perverts the soul, making man a sharer in the unspeakable orgies of ancient evil forces.