The Grand mystery, or Art of meditating over an house of office, restor'd and unveil'd; after the manner of the ingenious Dr. S-ft [electronic resource] : With observations historical, political, and moral; on the dignity, usefulness, and pleasantness, of that study. With several new improvements, and proposals for better accommodating the nobility and gentry of both sexes, in their natural necessities, and for making London the most magnificent city in the world. Dedicated to the profound Dr. W-. Seriously recommended to such as drink the mineral waters of Pyrmont, Bristol, Bath, Tunbridge, Epsom, Scarborough, Acton, Dulledge, Islington, and other places.