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.

"Zoonomia; or, The Laws of Organic Life" is a pioneering clinical and philosophical work written through Erasmus Darwin, an 18th-century English physician, herbal truth seeker, and grandfather of Charles Darwin. "Zoonomia" is a groundbreaking exploration of diverse elements of biology, medicine, and the natural international. Erasmus Darwin's "Zoonomia" is a comprehensive examination of the standards governing natural lifestyles. The book covers a huge range of subjects, which includes anatomy, physiology, pathology, and the philosophy of existence. Darwin's work become high-quality for its early advocacy of evolutionary ideas, as he recommended that species could change through the years via a technique of model. One of the maximum giant contributions of "Zoonomia" is its exploration of the idea of transmutation, which laid the groundwork for later evolutionary theories. Erasmus Darwin proposed the concept that all life forms shared a commonplace ancestry and that they could undergo slow variations to better suit their environments. Although not as well-known as his grandson Charles Darwin's later paintings on evolution, "Zoonomia" changed into an important precursor to the improvement of evolutionary thought. It also contributed to the wider scientific and clinical discussions of its time, making it an enormous work in the history of biology and herbal philosophy.