Early John Murray printing (1873, Tenth Thousands) of Darwin's "The Expression of the Emotions in Man and Animals", one of his most influential and innovative works following The Descent of Man. In this groundbreaking study, Darwin argues for the evolutionary continuity of emotional expression between humans and animals, proposing that facial expressions, gestures, and bodily reactions are inherited traits shaped by natural selection. The book presents his famous three principles of expressionâ"serviceable associated habits, antithesis, and direct action of the nervous system. Notably, this work was among the first scientific books to incorporate photographic illustrations as evidentiary material. The heliotype plates of infants and patients (including the well-known crying children plates) were revolutionary for their time and reflect Darwinâs commitment to empirical documentation. Illustrated throughout with engravings by T. W. Wood and others, including expressive studies of cats, dogs, birds, and primates. A cornerstone text in evolutionary psychology, behavioral science, and the history of photography in scientific publishing. Book in overall very good condition, externally original cloth with very little signs of wear, bright gilt-see photos, inside light pencil marginalia on a few pages, light stains but overall clean and complete. Scarce in any edition!!!!