Salem / Boston: S. E. Cassino, 1879 / 1880. First edition of this major botanical work. Two volumes, complete. Illustrated with a total of 81 full-color plates by J. H. Emerton and C. E. Faxon. Eaton performed his graduate studies under Asa Gray at Harvard but otherwise spent his entire career at Yale, both as a student and professor and his botanical collections are housed at Yale's Peabody Museum. Bound by "Scheffer, Binder, Harrisburg" in quarto three-quarter and green pebbled-cloth boards; spines each with five raised bands and lettered and ruled in gilt. Volume one (352 pp.) trimmed quarter-inch at fore edge and, inexplicably, a quarter inch at bottom of its first 160 pages which are also a little darkened and somewhat foxed. Scattered foxing mostly confined to margins of remaining pages (both volumes). Endpapers creased, bindings a bit scuffed; altogether about very good.