The Society’s map is of primary interest as revealing a conception of the earth’s surface typical of the century preceding the discovery of America. In its blending of colors and pleasing general composition it forms a work of art of no slight decorative value. Furthermore, the encircling calendar and many details on the map proper are distinctly unusual.[5] The Society has therefore undertaken the publication of a full-sized colored facsimile, in explanation of which the present book was prepared. Drawn on a piece of parchment measuring 28½ by 23⅜ inches (72.4 × 59.4 cm.), the original is in a fair state of preservation except for two pieces torn from the left-hand side, for discolorations, and for the fading of some of the inscriptions. Fortunately, no part of the map itself has been seriously injured. The Calendar and the Inscription Beneath It The calendars encircling Leardo’s three maps constitute exceptional additions. Of these calendars, the one on the Society’s map is the most interesting. The inscription in the panel below the circles, in part an explanation of the calendar, is somewhat awkwardly phrased in the Venetian dialect of the fifteenth century, but, although it lacks the beginning of each line, the meaning is fairly clear, especially when certain of the missing lines are reconstructed from the corresponding inscription on the map in Vicenza.[6] In the first two lines the cartographer makes an excursion into the realm of theology. According to Dr. Arthur C. McGiffert, to whom the present writer submitted the passage, this part of the inscription is “evidently not the work of a theologian, for it makes God the creator ‘of all things created and _un_created’ (the credal phrase is ‘things visible and invisible’), and in the next clause runs the Trinity (‘three persons and one common substance’) and the person of Christ together as if they were the same thing. There are reminiscences of the Nicene creed, but the whole is theologically a hodge-podge.” This passage is followed by a statement that the map shows how the land and islands stand in relation to the seas and how the many provinces and mountains and principal rivers are distributed on the land. Then, on the asserted authority of Macrobius, “a very excellent astrologer and geometrician,” figures are given for the dimensions of the earth and of various heavenly bodies. These are quite fanciful, bearing little relation to the corresponding figures actually cited by Macrobius.[7] The astronomical details are followed in the third paragraph by the explanation of the calendar. The latter consists of eight concentric circles, of which the innermost gives the dates of Easter for ninety-five years, from April 1, 1453, to April 10, 1547; when Easter falls in April, _A_ is written in the small compartment, when in March, _M_; leap years are designated by _B_ (“bissextile years”).