xx, [17]-761 pp. Edited, with additional chapters by Dr. A.H. Guernsey. Illustrated with nearly 200 wood engravings. 8½x6, original green cloth decorated and lettered in gilt. First part includes new material on the acquisition of Alaska and on C. F. Hall's expedition on 1860-62. Considerable detail on climate, vegetation, mammals, birds, seas, marine animals, regional sketches of exploration, peoples, etc. This is a combination of the author's Polar World and his Tropical World, first published in German.