If, however, such similarities eventually made for the union of the cults, traditions were not lacking regarding their early differences or hostilities. As has been said, myths survived into historical times, which stated that although Quetzalcoatl had succeeded in discovering maize, Tlaloc had stolen it from him and had also succeeded in alienating from him the affection of Chalchihuitlicue, who had originally been regarded as the wife of Quetzalcoatl. [31] But these myths are undeniably of late origin. Quetzalcoatl’s status as a celibate god or priest would scarcely allow his name to be connected with matrimony, and it is plain that Chalchihuitlicue, the water goddess, is in a sense merely a personification of the chalchihuitl stone, which was, perhaps, originally one of the symbols of the Quetzalcoatl cult and which later became personified in female form, thus giving rise to the myth in question. Nor do these tales necessarily prove the priority of the Quetzalcoatl cult, which was indeed regarded as responsible for practically all Mexican civilization and which would naturally be credited with the introduction of the use of the sacred stones. THE CULT OF OBSIDIAN But if the later Nahua immigrants also came to regard these chalchihuitl stones with reverence, at the period of their entrance to the Mexican plateau they paid devotion to a mineral of a very different kind. And this it is which helps us to regard their faith as differing entirely from those other faiths which already flourished in the land. The mineral with which their cult was so closely connected was obsidian, a vitreous natural glass found in the upper volcanic strata of Mexico and northern California, which flakes readily from the core by pressure and gains by mere fracture a razor-like edge of considerable penetrative power. The principal quarry of this volcanic glass was the mountain known as the Cerro de las Navajas (“hill of the knives”) near Timapan, and from this centre the itztli, by which name obsidian was known to the Mexicans, was widely distributed by barter over a very considerable area. There would seem to be proof that this mineral, so suitable for the purposes of the nomadic hunter, was anciently known far to the north of Mexico. The observations of Dr. G. M. Dawson [32] in British Columbia satisfied him that trading intercourse was engaged in by the coast tribes with those of the interior along the Frazer River Valley and far to the south. From the remotest times embraced in their native traditions, the Bilqula of Dean Inlet have possessed a trade route by way of the Bella Coola River to the Tinné country, along which trail broken implements and chips of obsidian have been found. Many of the routes in British Columbia have also yielded chips and flakes of obsidian, which, the Tinné Indians stated, was obtained from a mountain near the headwaters of the Salmon River (about long. 125° 40′, lat. 52° 40′), formerly resorted to for