of nearly two hundred large folio pages on the earliest manuscript and printed maps, two of the former, dated 1527 and 1529, accompanying the work, reproduced in chromo-lithographic fac-simile. The same author has produced other works on the subject, the most important being _A History of the Discovery of the East Coast of North America, published in Collections of the Maine Historical Society_, 2d series, vol. i., Portland, 1869. This contains reduced copies of twenty-three early maps, and is perhaps the most complete work existing, so far as the northern coasts are concerned, giving comparatively little attention to more southern voyages. _Kunstmann_, _Die Entdeckung Amerikas_, Munich, 1859, is a careful compilation of ninety-six imperial quarto pages, with copious notes and references, written to accompany a collection of thirteen large chromo-lithographic reproductions of manuscript maps preserved in the Academy of Sciences at Munich, and generally known as the _Munich Atlas_. Herr Kunstmann treats chiefly of the Atlantic islands, with special reference to the connection between the discoveries of Spaniards and Northmen. _Major's Life of Prince Henry of Portugal_, London, 1868, is the best authority for Portuguese voyages as well as for the revival of maritime enterprise in the fifteenth century. _Stevens' Historical and Geographical Notes on the Earliest Discoveries in America, 1453-1530_, New Haven, 1869, was written originally as an introduction to a book by the author's brother on his proposed interoceanic communication via Tehuantepec. It is a concise statement of the whole matter, presenting some of its phases in a practically new light. _Varnhagen_, _Le Premier Voyage de Amerigo Vespucci_, Vienna, 1869, must not be omitted as the chief support of a theory on Vespucci's voyages which nearly concerns the first discovery of our Pacific States territory proper. _Rafn_, _Antiquitates Americanæ_, Hafniæ, 1837, is the source of nearly all our knowledge of the discoveries of the Northmen in America in the tenth and following centuries; and _De Costa_, _The Pre-Columbian Discovery of America_, Albany, 1868, presents an English translation of the same Icelandic _sagas_ in which the enterprises of the Northmen are recorded. The _Cartografía Mexicana_ of Orozco y Berra, published by the Mexican Geographical Society, contains, as its title indicates, a mention of early maps in chronologic order; and the _Mapoteca Colombiana_ of Urricœchea, London, 1860, is another important contribution of similar nature. There should be mentioned the excellent review given in the first volume of _Bryant's History of the United States_, which has appeared since this Summary was written; and I might present quite a list of papers read before the various learned societies of Europe and America on different topics connected with this subject in late years, none of them I believe materially affecting my conclusions.