The map is not well preserved, a fact easily recognized in the reproduction. Certain parts, it will be noted, are entirely wanting, having fallen away from the old mounting, but there is little missing that is of the first importance excepting the northwest section of South America, the western Mediterranean lands and portions of the island region southeast of Asia. Though many of the names are illegible by reason of discoloration, it was thought inadvisable to attempt the cleaning of the surface on account of the brittle condition of the old paper. The eighteen sheets in the facsimile, corresponding to the eighteen sheets of the original, together with the key plate much reduced but showing the entire map, have been printed on a fine quality of Van Gelder hand-made paper. Care has been exercised to have each of the sheets appear in the reproduction as in the original, in so far as has been possible, no attempt being made to remedy defects. Blaeu’s map may be considered a remarkably excellent record of geographical knowledge to date. Most of his striking errors in continental outlines are the common errors of the day. In the Old World, for example, Africa has a breadth of more than eighty degrees, and the east coast of Asia, particularly its northern half, is far from accurate, but he has given us a representation of the extreme northeast section which is superior to that laid down on the large world map of his fellow countryman Hondius. The latter clearly suited his representation to a belief in a perfectly open sea route to China and the distant Orient, showing a great breadth of sea between Asia and America in the region of Bering Strait, while Blaeu has here a fairly accurate record of the geographical features of the region, inserting the name “Streto de Anian.” The Mediterranean has much too great an extension in longitude, and is too narrow; the Caspian Sea and the Black Sea have each a strikingly erroneous representation as well as location. The great austral continental land called “Magallanica,” in the New World hemisphere, is that which so commonly appears in the world maps of the day. In the New World, North America is made to extend through more than one hundred and sixty degrees of longitude, while South America is given a breadth of more than sixty degrees, and its general outline is not well done, though there is here clearly an improvement over the maps of Mercator and of Ortelius. Blaeu has retained the erroneous representation of the “Martin Forbischers Strate” at the southern extremity of Greenland; he includes “Frislandia” south of “Islandia”; “I dos Demonios” east of “Terra de Labrador”; “Brasil” west of “Hibernia al Yrlandia,” “As Mann” to the southwest; “S. Brandan” near “C. d. Breton.” For the region north of Europe and Asia, the map is especially interesting, making record here of the latest attempts under Willem Barentszoen and other less distinguished explorers from Holland who undertook to find a northeast