xxiv.] The association of this stone and its color, a bluish green of various shades, with the God of Light and the Air, may have reference to the blue sky where he has his home, or to the blue and green waters where he makes his bed.

Whatever the connection was, it was so close that the festivals of all three, Tlaloc, Chalchihuitlicue and Quetzalcoatl, were celebrated together on the same day, which was the first of the first month of the Aztec calendar, in February.[1] [Footnote 1: Sahagun, _Hisioria_, Lib.

ii, cap.i.A worthy but visionary Mexican antiquary, Don J.M.Melgar, has recognized in Aztec mythology the frequency of the symbolism which expresses the fertilizing action of the sky (the sun and rains) upon the earth.

He thinks that in some of the manuscripts, as the _Codex Borgia_, it is represented by the rabbit fecundating the frog.

See his _Examen Comparativo entre los Signos Simbolicos de las Teogonias y Cosmogonias antiguas y los que existen en los Manuscritos Mexicanos_, p.