* * * * * The well-known pages 19 and 20 come next. Together they make four compartments, up and down the full length of the pages, two with red and two with black backgrounds. Each is, or rather was, preceded by a column of 13 “year-bearers.” The left column on each page I have restored, although no traces of it are left. But apart from its manifest necessity, as part of the series, if the width of the red ground on page 20 (see the photographs) is measured, it will be found to be just the correct proportion, and part of the straight left edge of the red can still be seen, just left of the rod in the hand of the mummy-figure, and leaving just room for the Ezanab column. In the colored plates I have only shown 12 instead of 13 day-signs in each column, but a measurement of the space above and below shows that the missing four are to be placed at the top and not at the bottom. These two pages therefore have application in some way to 52 solar years, beginning with 1 Lamat and ending with 13 Akbal (Votan). These “year-bearers” are those of the Tzental instead of the Yucatecan system, as described by Landa, and on these two pages rests, so far as regards known subject-matter, the assignment of the Codex Perez to the Palenque rather than to the northern Maya district. It is thus to be considered with the Inscriptions of that region, and with the Dresden Codex.[28-*] And in accord with what is known of the state of the different parts of the country at the time of the Conquest, and of the history of the break-up and extinction of the Maya empire, it must be assigned the greater antiquity on that account. It is probable that pages 19 and 20 had no text passages. * * * * * Pages 21 and 22 again, judging from the coloring and the arrangement, seem to form a pair. Each had on the upper part probably five rows of glyphs, some 70 in all, of which only 10 or 12 are at all recognizable. Contrary to all the pages hitherto discussed, it may be that these glyphs are to be _read from right to left_. The faces in these all look to the right, and the customary prefixes are all on the right. In classifying these glyphs, therefore, they must be all reversed.