The arrangement and distribution of the rooms within the clusters indicate an occupancy extending over a considerable period of time. A reference to the ground plan will show that continuous wall lines are the exception, and it is seldom that more than two or three rooms are grouped together in regular order. In irregularity of arrangement the inhabitants of this village followed a general habit, the result of which can be seen today in all the inhabited villages and in most of the large pueblo ruins. It indicates a steady growth of the village by the addition of rooms, one or two at a time, as they were needed. The division into clusters, however, indicates an aggregation of related gentes or subgentes banded together for protection. Given these conditions, (1) bands of related families living near one another; (2) hostile pressure from outside; and (3) a site not in itself easily defended, and a ground plan similar to the one under discussion must result. Single detached rooms would not be built when the village might be attacked at any time, but they might be added during periods of peace and, the conditions being favorable, they might form the nuclei of other clusters. It is possible that some of the clusters forming this village had their origin in this manner, but this question can not be determined from the ground plan, as a similar result would be produced by the advent of a small band of related families. Growth in number of rooms does not necessarily indicate growth in population, and this qualification must not be lost sight of in the discussion of pueblo ground plans. Among the Pueblos of today, descent, in real property at least, is in the female line; when a man marries he becomes a member of his wife’s family and leaves his own home to live with his wife’s people. If the wife’s home is not large enough to contain all the members of the household, additional rooms are built adjoining and connected with those previously occupied. It may be mentioned in this connection that the women build the houses, although the men supply the material and do the heavy work. The result of this custom may be readily seen: a family in which there are many daughters must necessarily increase the space occupied by it, while a family consisting of sons, no matter how many they may be, will become extinct, so far as regards its home in the village. It is no uncommon thing to see in the villages of today several rooms in course of erection while there are a dozen or more rooms within a few steps abandoned and going to decay. Long occupancy, therefore, produces much the same effect on a ground plan of a village as a large population, or a rapidly growing one, except that in the former case irregularity in the arrangement of rooms will be more pronounced.