It likewise has been seen that through very natural causes a strict division between the dwellings of the women and children and of the adult male population of the cliff villages grew up. From the relatively great numbers of the kivas found in the courts of the round towns, it may be inferred that this division was still kept up after the cliff dwellers became inhabitants of the plains and builders of such round towns; for when first the Spaniards encountered the Zuñi dwellers in the Seven Cities of Cibola they found that, at least ceremonially, this division of the men's quarters from those of the women was still persisted in, but there is evidence that even thus early it was not so strictly held to on other occasions. Then, as now, the men became permanent guests, at least, in the houses of their wives, and it is probable that the cause which broke down this previous strict division of the sexes was the union of the western or rancheria building branch of the Zuñi ancestry with the cliff and round-town building branch. In nothing is the dual origin of the Zuñis so strongly suggested as in the twofold nature of their burial customs at the time when first they were encountered by the Spaniards; for according to some of the early writers they cremated the dead with all of their belongings, yet according to others they buried them in the courts, houses, or near the walls of their villages. It has already been stated that the cliff dwellers buried their dead in the houses and to the rear of their cavern villages, and that, following them in this, the dwellers in the round towns buried their dead also in the houses and to the rear--that is, just outside of their villages. It remains to be stated that nearly all of the Yuman tribes, and some even of the Piman tribes, of the lower Colorado region disposed of their dead chiefly by cremation. Investigation of the square-house remains which lie scattered over the southwestern and central portions of Arizona would seem to indicate that the western branch of the Zuñi ancestry continued this practice of cremating the greater number of their dead. If this be true, the custom on the one hand of cremating the dead, which was observed by Castañeda at Mátsaki, one of the principal of the Seven Cities of Cibola, and the practice of burying the dead observed by others of the earliest Spanish explorers, are easily accounted for as being survivals of the differing customs of the two peoples composing the Zuñi tribe at that time. As has been mentioned in the first part of this introductory, both of these very different customs continued ceremonially to be performed, even after disposal of the dead solely by burial under the influence of the Franciscan fathers came to be an established custom.