Memoranda on Poisons is a comprehensive and practical guide to the study of toxicology, originally authored by Thomas Hawkes Tanner, a renowned 19th-century physician. Designed primarily for medical students, practitioners, and those involved in forensic medicine, the book offers a detailed examination of the most significant poisons encountered in medical and legal practice. It systematically covers the sources, physical and chemical properties, symptoms, fatal doses, periods of action, post-mortem appearances, and treatment of a wide range of poisons, including mineral, vegetable, and animal toxins. The text is organized for quick reference, making it an invaluable resource for those needing immediate information in cases of suspected poisoning. Each entry provides concise yet thorough memoranda on the identification and management of specific poisons, such as arsenic, strychnine, opium, and corrosive sublimate, among many others. The book also addresses the medico-legal aspects of poisoning, offering guidance on the detection of poisons in the body and the interpretation of toxicological findings in a legal context. Memoranda on Poisons reflects the medical knowledge and forensic practices of its time, providing historical insight into the evolution of toxicology. Its clear organization, practical focus, and wealth of information have made it a classic reference for generations of medical professionals. Whether used as a study aid, a clinical reference, or a historical document, this work remains a testament to the importance of toxicological knowledge in both medicine and law.