London: John Murray, 1872. First edition, first issue. Rebacked green cloth with blind rule, gilt spine title. Bookplate to front pastedown, edges rubbed, light wear to endpapers, mild and faint scuffing to boards, discoloration to spine tips from re-backing, overall a near fine, bright and tight copy.. With 7 heliotype plates, including 3 fold-outs, as well as additional sketches throughout text by various artists.. Octavo. vi, 374, 4 (ads). 5.25" x 7.5". Lacking blank page before the title leaf; else complete. In this significant text of evolutionary theory and psychology, Darwin investigates the facial manifestations of emotions and what they can mean for mankind. Starting this project as early as 1838, Darwin originally planned to insert his research as a chapter in The Descent of Man. Instead, he expanded it into a book of its own published a year later. Perhaps against the advice of his profit-conscious publisher, Darwin includes printed photographs, making Expression one of…