"Zoonomia" by Erasmus Darwin is a seminal work that explores the principles of physiology, medicine, and the evolution of life. Published in the late 18th century, this comprehensive two-volume work reflects Erasmus Darwin's visionary ideas on the interconnectedness of living organisms and the dynamic processes governing life. In "Zoonomia," Erasmus Darwin anticipates some aspects of evolutionary theory that his grandson, Charles Darwin, would later expand upon. The book delves into topics such as the adaptability of organisms, the influence of environmental factors, and the concept of a common ancestry. Erasmus Darwin's writing style is poetic and expansive, combining scientific observation with philosophical musings. "Zoonomia" is a testament to the author's curiosity and forward-thinking perspective, laying the groundwork for future discussions on evolution and the interconnectedness of all living things.

Zoonomia; or the Laws of Organic Life is a two-volume medical work by Erasmus Darwin dealing with pathology, anatomy, psychology, and the functioning of the body. Its primary framework is one of associationist psychophysiology. The book is famous for its early ideas relating to the theory of evolution, specifically forms of developmentalism similar to Lamarckism. The first volume is divided into 40 sections, on a range of topics related to the body, the senses, and disease. He classifies bodily and sensory motions as "irritative," "sensitive," "voluntary," and "associative." He presents theories on the production and classes of ideas, and seeks to explain the causes and mechanisms of sleep, reverie, vertigo, and drunkenness. He then discusses anatomy, especially the operation of the circulatory system and various glands. The second volume, published in 1796, is focused on classifying diseases into classes, orders, and genera. The book is divided into four major sections, based on his four classes of disease: diseases of irritation, sensation, volition, and association.