Page PLATE 1. The Maya territory, showing locations of principal cities (map) 1 2. Diagram showing periods of occupancy of principal southern cities 15 3. Page 74 of the Dresden Codex, showing the end of the world (according to Förstemann) 32 4. Diagram showing occurrence of dates recorded in Cycle 9 35 5. Tonalamatl wheel, showing sequence of the 260 differently named days 43 6. Glyphs representing Initial Series, showing use of bar and dot numerals and normal-form period glyphs 157 7. Glyphs representing Initial Series, showing use of bar and dot numerals and head-variant period glyphs 167 8. Glyphs representing Initial Series, showing use of bar and dot numerals and head-variant period glyphs 170 9. Glyphs representing Initial Series, showing use of bar and dot numerals and head-variant period glyphs 176 10. Glyphs representing Initial Series, showing use of bar and dot numerals and head-variant period glyphs--Stela 3, Tikal 178 11. Glyphs representing Initial Series, showing use of bar and dot numerals and head-variant period glyphs--Stela A (east side), Quirigua 179 12. Glyphs representing Initial Series, showing use of head-variant numerals and period glyphs 180 13. Oldest Initial Series at Copan--Stela 15 187 14. Initial Series on Stela D, Copan, showing full-figure numeral glyphs and period glyphs 188 15. Initial Series on Stela J, Copan 191 16. Initial Series and Secondary Series on Lintel 21, Yaxchilan 207 17. Initial Series and Secondary Series on Stela 1, Piedras Negras 210 18. Initial Series and Secondary Series on Stela K, Quirigua 213 19. Initial Series and Secondary Series on Stela F (west side), Quirigua 218 20. Initial Series on Stela F (east side), Quirigua 220 21. Examples of Period-ending dates in Cycle 9 223 22. Examples of Period-ending dates in cycles other than Cycle 9 227 23. Initial Series, Secondary Series, and Period-ending dates on Stela 3, Piedras Negras 233