The Impostor detected : Or, The physician the greater cheat: being a candid enquiry concerning the practice of Dr. Mayersbach; commonly known by the title of The German doctor. Containing a faithful account of many remarkable cures performed by him which had been deemed incurable, and therefore declined by physicans of eminence. Being a full refutation of the sophistical arguments and invidious reflections of Dr. Lettsom and others. And shewing his practice to be defensible upon natural and philosophical principles.