In “Degeneration: A Chapter in Darwinism,” E. Ray Sir Lankester explores the contentious discourse surrounding evolutionary theory in the late 19th century, particularly focusing on the concepts of degeneration and evolution. Through meticulous examination of biological, sociological, and anthropological perspectives, Lankester presents a critical analysis of how certain species, including humanity, might regress rather than progress. The book is characterized by Lankester's eloquent prose and rigorous scientific inquiry, blending historical context with contemporary debates on natural selection and adaptations, thus situating itself within the broader Victorian dialogue on evolution. E. Ray Sir Lankester was a prominent biologist and a staunch defender of Darwinian theory, whose career was deeply influenced by the scientific upheaval of his time. A passionate advocate for evolutionary biology, Lankester's intellectual journey was marked by his commitment to debunking the misconceptions surrounding degeneration. His position within the scientific community and his explorations of life sciences provided him with a unique perspective that shaped his arguments in this pivotal work, reflecting both his scholarly rigor and personal convictions about the unfolding complexities of life. For scholars, students, and general readers alike, “Degeneration: A Chapter in Darwinism” is an invaluable resource that not only elucidates critical aspects of evolutionary theory but also challenges preconceived notions of progress and regression in nature. Lankester's compelling narrative and astute observations make this book a thought-provoking addition to any collection focused on evolutionary biology, philosophy of science, or the history of ideas.