Grant Allen's 'The Colour-Sense: Its Origin and Development' is a groundbreaking work that delves into the evolution of color perception in humans. Published in 1879, Allen's book explores the scientific and psychological aspects of how the human mind interprets and distinguishes colors. Written in a clear and accessible style, the book provides a comprehensive overview of the origins of the color sense and its development throughout history, drawing on research from various disciplines including physiology and psychology. Allen's attention to detail and meticulous research make this book a valuable resource for anyone interested in the study of human perception and cognition. Grant Allen, a prolific Canadian author and scientist, was known for his contributions to natural history and evolution. His expertise in these fields is evident in 'The Colour-Sense', as he skillfully combines scientific knowledge with a literary flair. I highly recommend 'The Colour-Sense: Its Origin and Development' to readers interested in the intersection of science and psychology, as well as those fascinated by the intricacies of human sensory perception.