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LIST OF ILLUSTRATIONS (All illustrations, except Figs, i, 15, and 23, are reproductions of medieval maps. The source is indicated in a general way in each title; the precise reference will be found in the text where the map is first discussed.} FIG. PAGE 1 Map of the Sargasso Sea, 1 72,000,000 28 2 The Pizigani, 1367 (two sections) 40-41 3 Beccario, 1426 facing 45 4 Dalorto, 1325 51 5 Catalan map, 1375 58 6 Nicolay, 1560 62 7 Catalan map, about 1480 64 8 World map in portolan atlas, about 1508 (Egerton MS. 2803) facing 74 9 Desceliers, 1546 76 10 Ortelius, 1570 77 11 Ptolemy, 1513 82 12 Prunes, 1553 88 13 Coppo, 1528 97 14 Bishop Thorlaksson, 1606 98 15 Map of the early Norse Western and Eastern Settlements of Greenland, 1 :6,4OO,ooo 103 16 Clavus, 1427 104 17 Donnus Nicolaus Germanus, after 1466 facing 105 1 8 Sigurdr Stefansson, 1590 107 19 Zeno, 1558 126 20 Beccario, 1435 152 21 Pareto, 1455 158 22 Benincasa, 1482 160 23 Representation of Corvo on fourteenth- and fifteenth- century maps as compared with its present outline . . 172 24 Buss Island, probably 1673 i?6 25 Bianco, 1436 179