We learn from Duran that so careful a record was kept of the population, by the Mexican priesthood, “that not even a newborn babe could escape detection.” The reason for this strict vigilance is clear, for the welfare of the community and the harmonious working of the complex machinery of state depended upon the constant renewal of vacancies caused by deaths in each department of industry and government. After this excursion into the realm of native thought let us now return to the Palenque tablets, placed in detached temples which approximately face the four cardinal points. On the tablet of the “Temple of the Cross” we have a tribal tree with symbols of the Middle and of the Four Quarters and of duality. A priest with a flower on his head presents a diminutive human figure to the totemic bird perched on the tree. Another, with a leafy branch on his head-dress, holds a conventional sceptre simulating a young growing shoot of maize. Behind each figure are rows of glyphs and in the upper corner to the left of the spectator is the septenary series headed by the initial-sign. In the “Temple of Cross II” we have a variant of the identical representation in which the maize plant and the sea shell are prominent. If I may hazard a suggestion of the meaning of these two tablets, I should say that they appear to be tribal registers most probably relating to the increase and decrease of the male and female population in all divisions and classes, during a fixed period of time. Both seem to commemorate the “renovation” or “new growth” of the tribal tree in a mode which would have been as intelligible to a Mexican, for instance, as to a Maya. The fact that the “Temple of the Sun” and that of the “Inscriptions” obviously held analogous registers, points to the alternative possibilities (1) that each temple was destined to preserve the register of the population and social organization, etc., of one of the four quarters of the capital and state, according to years; (2) that the trees in the “Cross temples” figured the male and female lineages of the ruling caste, whilst the tablet in the “Temple of the Sun” recorded the numbers of conquered people reduced to slavery and the “Temple of Inscriptions” preserved the register of female children or of vassals; (3) that each of the four temples preserved a complete register of the entire state and had been erected consecutively at the conclusion or beginning of eras, the difference observable in the central motif conveying the salient feature or event marking each special epoch and recording, according to years, the organization of the state during its course.