Leaving the subject of the calendar for the present we must revert to my tables recording the apparent annual and nocturnal axial rotation of the circumpolar constellations. Whilst studying these the reflection naturally arose, that the people who observed Ursa Major must have paid equal attention to Cassiopeia and noticed that these constellations ever occupied opposite positions to each other as they circled around the pole. Dwelling on the fact that in ancient Mexico Ursa Major was associated with an ocelot, I remembered the many representations in which an ocelot is represented as confronting an eagle, usually in mortal combat. Mexican war-chiefs were classed into two equally honorable grades, designated as the “ocelots and the quauhtlis, _i. e._, eagles.” The constellation of Cassiopeia presents to me, a marked resemblance to the image of a bird with outspread wings, whose head is turned toward Polaris. The fact that when this star-group seems to be above, Ursa Major seems to be below, and _vice versa_, would obviously suggest the idea of an eternal combat between two adversaries who alternately succumbed and resuscitated. It was interesting on reasoning further, to note that once the above idea had taken root it must have been impossible not to associate in course of time, the quadruped and the bird with the elements to which they seemed to pertain, and gradually to conceive the idea of an everlasting antagonism between the powers of the sky and of the earth, or light and darkness, and other opposites which suggested themselves naturally, or were artificially created, by the fertile mind of man. In this connection it should be observed that the mythical adversary of Tezcatlipoca, the ocelot, designated as Ursa Major, is Huitzilopochtli, whose idol, in the Great Temple of Mexico, represented him masked as a hummingbird (see Atlas Duran). The special reason why this bird became associated with the god is explained by the following passage in Gomara (Histoire générale des Indes. Paris, 1584, chap. 96, p. 190): “This bird died, or rather fell asleep in the month of October and remained attached by its feet to a twig. It awakened again in April when the flowers blossomed. For this reason, in the language of the country it is named Huitzitzilin, the resuscitated.” We therefore see that whilst it is stated in the myth that the ocelot arose again after having been cast down from the sky by Huitzilopochtli, the very name of the latter betokened that the bird-god had also only just “resuscitated” from a presumably similar defeat. [Illustration.] Figure 8.