Each third of the lunar calendar consists of 30-and 29-day months arranged in alternating sequence, with intercalary days added by the substitution of a 30-day for a 29-day month when the error arising from the nonconformity of the moon’s revolution reaches more than one day. In order that the lunar calendar might agree with the eclipse calendar more closely, these months were recorded in groups of five and six. The months in each third of the series were divided into three groups, which are the same in each third. The first two groups contained 47 months each, and completed the first sixteen dates of the third. The last group was one of 41 months, which was represented by the last seven dates of the third. An intercalary day was added in the 32d month of each of the 47-month groups to correct the accumulating error, thereby causing the 6th and 14th subdivisions of the third to be of 178 days. In the first and last third the 40th month of the 41-month group also contained an intercalary day for the same reason, making the 23d subdivision 178 days, but in the last column of the record this extra day is added by going from the middle to the lower line of day signs. Each of the 47-and 41-month divisions began and ended with a month of thirty days. The numerical series of these pages of the Dresden record, then, an eclipse calendar which is referred to a lunar calendar. This solution explains all the irregularities of the series except those which seem clearly to be clerical errors of the scribe. Only the numerical and calendrical series on these pages have been considered. No attempt has been made to explain the hieroglyphs, the pictures, or the first two pages, which, although showing a close association to the long series, are nevertheless a unit in themselves. BIBLIOGRAPHY BOWDITCH, C. P. 1910. The Numeration, Calendar Systems and Astronomical Knowledge of the Mayas. Cambridge. FÖRSTEMANN, E. 1886. Erläuterungen zur Mayahandschrift der Königlichen öffentlichen Bibliothek zu Dresden. Dresden. 1898. Zur Entzifferung der Mayahandschrift, VII. Dresden. (Trans. in Bull. 28, Bur. Am. Ethnol., pp. 463-72.) 1901. Commentar zur Mayahandschrift der Königlichen öffentlichen Bibliothek zu Dresden. Dresden. (Trans. in Papers of the Peabody Museum, Vol. IV, No. 2.) MEINSHAUSEN, MARTIN. 1913. Über Sonnen- und Mondfinsternisse in der Dresdener Mayahandschrift. Zeit. für Ethnol., Bd. XLV, pp. 221-227. SCHRAM, R. 1908. Kalendariographische und Chronologische Tafeln. Leipzig. THOMAS, CYRUS. 1888. Aids to the Study of the Maya Codices. 6th Ann. Rep., Bur. Am. Ethnol., pp. 253-371. PRINTED AT THE HARVARD UNIVERSITY PRESS CAMBRIDGE, MASS., U. S. A. PEABODY MUSEUM PAPERS. VOL. VI, NO. 2, PLATE 1 [Illustration: DRESDEN CODEX, PAGES 51 TO 58.]