The parti-colored symbol combined with the cross obviously signifies a duality, such as light and darkness, the Above and the Below and a series of dualities—possibly the two divisions of the year, the dry and rainy seasons. In Mexico we are authorized by documentary evidence, to give a wider and deeper interpretation to the symbol of duality, for it can be absolutely proven that the Mexican philosophers divided the heavens into two imaginary portions, and respectively identified these with the male and female principles. In Nahuatl the West was designated as Cihuatlampa, “the place or part of the women.” The souls of the women who had earned immortality were supposed to dwell there, whilst the souls of the men resided in the East. In the appendix to book III of Sahagun’s Historia, it is described how, according to the native belief, the souls of the male warriors hailed the daily appearance of the sun above the eastern horizon, and escorted it to Nepantla, the zenith. Here the souls of the women awaited it and assumed the duty of escorting the sun to the western horizon, the symbol for which was calli=the house. The above passage indicates that the native philosophers imagined across the middle of the sky a line of demarcation, separating the portions of the heaven respectively allotted to the male and female souls. For four years after death these souls retained their human form, and then, after passing through nine successive heavens, entered into the celestial paradise where they assumed the forms of different kinds of butterflies and humming-birds. The names of these are enumerated in the Nahuatl text of Sahagun’s Laurentian MS. (book III).(5) The symbolism of the humming-bird has already been explained by a passage cited from Gomara’s Historia. In this connection it is extremely interesting to find the humming-bird represented in the B. N. MS., as sucking honey from a flower, which is attached by a cord, covered with bird’s down, to a bone, the symbol of death. This peculiar but expressive group of symbols figures only on the head-dresses of deities wearing certain other symbols, amongst which we find the Eca-cozcatl and Eca-xonequilli the image of Ursa Minor, already described.