First Edition, Fourth Issue, with "Seventh Thousand" on title page of both volumes. Wood engraved illustrations, includes half titles but no advertisements at rear. Contemporary 3/4 leather, marbled boards, endpapers and page edges. The first appearance of the word "evolution" in works by Darwin. A sound and firmly bound Very Good set, if not terribly attractive, some spine labels lacking (see image), leather darkened at spine, edge wear. Item #601910

First Edition. Volumes III & IV only of a larger set of 12 Volumes, 7 Volumes of 'Mandibulata', and 4 volumes of ‘Haustellata’. Includes early entries by Charles Darwin, whose first appearance in print occurred in volume II of this set. Darwin trained originally as a medical doctor but abandoned medicine to pursue entomology. Quarto, marbled boards, and green spine binding. Covers detached, spine material lacking, plates in clean condition, all plates present. Item #19235