One serious disadvantage, arising from the circumstance that the present investigation has been in press for nearly three years, is my inability to make any alteration, amendment, or addition, in the earlier portions, which stand as written at different times. It is a matter of regret to me that I was not acquainted with O’Neil’s “Night of the Gods” and Hewitt’s “Ruling Races of Prehistoric Times,” at an earlier stage of my investigation, as through them my publication would have been enriched by many valuable additions which I could have incorporated in the body of my work without unduly sacrificing its unity of form. In the line of Maya investigation notable advances have been made since I wrote (on page 221), about the “septenary set of signs” described by Mr. A. P. Maudslay in 1886, and about the inscription on the tablet of the Temple of the Cross at Palenque (pp. 237-39). Since that time an important publication on the Tablet of the Cross, to which I should have liked to refer, has been issued by the much esteemed Nestor of Maya investigations, Herr Geheimrath Dr. Förstemann. My attention has also been drawn by the best versed of American students of the Maya Codices, Mr. Charles P. Bowditch, to the fact that Mr. Maudslay now recognizes the general recurrence of an eighth sign in combination with the septenary group, causing this to consist of an initial glyph, followed by seven instead of six signs. Referring the reader to pp. 221 and 222, I point out that the employment of an initial glyph, representing the synopsis of a whole, followed by seven signs, appears even more strongly to corroborate my view that the inhabitants of Copan were acquainted with the septenary, cosmical division I have traced.