A Treatise on Foreign Teas: Abstracted from an Ingenious Work, Lately Published, Entitled An Essay on the Nerves is an 18th-century exploration into the world of tea, its varieties, and its effects on human health, particularly the nervous system. Drawing from the medical and scientific understanding of the time, the book offers a detailed account of the origins, qualities, and classifications of foreign teas, with a particular focus on those imported into England. It discusses the distinctions between green and bohea teas, their methods of preparation, and the perceived virtues and drawbacks of each type. The treatise delves into the physiological impact of tea consumption, referencing contemporary theories about the nerves and their role in health and disease. It warns of the potential dangers of excessive tea drinking, such as nervous disorders, weakness, and other maladies, while also acknowledging the beverage’s popularity and social significance. The work is interspersed with practical advice for selecting, storing, and brewing tea, as well as observations on adulteration and the commercial practices of tea merchants. Written in a style characteristic of the Enlightenment era, the treatise combines scientific curiosity with moral and social commentary, offering readers both a guide to the fashionable beverage and a reflection on its place in 18th-century society.