"Memoranda on Poisons" by Thomas Hawkes Tanner is a scientific publication written in the late 19th century. This work serves as a comprehensive guide to toxicology, providing essential information for medical practitioners and students on the properties, effects, classifications, and treatment of various poisons. The content aims to enhance understanding and responsiveness in cases of poisoning, highlighting potential symptoms and antidotes. At the start of the book, the author outlines the nature and modes of action of poisons, emphasizing their variety and complexities. Tanner discusses the difficulties in defining what constitutes a poison, noting that many substances can be harmful at improper doses. The opening chapters also provide a preliminary classification system for poisons and begin detailing the diagnosis of poisoning, elaborating on the responsibilities that fall to medical professionals when dealing with such emergencies. Overall, the beginning sets the stage for a detailed yet accessible exploration of poisons and their implications in medical practice. (This is an automatically generated summary.)