vi, 374 + 4 ad pp. Illustrated with 7 heliotype plates from photographs, with multiple images, 3 of them folding; 21 cuts in the text. 7½x4¾, original cloth, spine lettered in gilt. First Edition.

Darwin's groundbreaking work on how animals, and man, express emotions using the muscles, tissue and bone which nature has provided. This is apparently the first use of heliotypes in a book. This is the first issue, according to Freeman, with “that” correctly spelled in first line of p.208. The plates are in first issue, with arabic numerals. The ads are dated November, 1872. Freeman 1141.