The adaptation, of this architecture to the peculiar environment indicates that it has long been practiced under the same conditions that now prevail. Nearly all of the ancient pueblos were built of the sandstone found in natural quarries at the bases of hundreds of cliffs throughout these table-lands. This stone readily breaks into small pieces of regular form, suitable for use in the simple masonry of the pueblos without receiving any artificial treatment. The walls themselves give an exaggerated idea of finish, owing to the care and neatness with which the component stones are placed. Some of the illustrations in the last chapter, from photographs, show clearly that the material of the walls was much ruder than the appearance of the finished masonry would suggest, and that this finish depended on the careful selection and arrangement of the fragments. This is even more noticeable in the Chaco ruins, in which the walls were wrought to a high degrees of surface finish. The core of the wall was laid up with the larger and more irregular stones, and was afterwards brought to a smooth face by carefully filling in and chinking the joints with smaller stones and fragments, sometimes not more than a quarter of an inch thick; this method is still roughly followed by both Tusayan and Cibolan builders.
Although many details of construction and arrangement display remarkable adaptation to the physical character of the country, yet the influence of such environment would not alone suffice to produce this architectural type. In order to develop the results found, another element was necessary. This element was the necessity for defense. The pueblo population was probably subjected to the more or less continuous influence of this defensive motive throughout the period of their occupation of this territory. A strong independent race of people, who had to fear no invasion by stronger foes, would necessarily have been influenced more by the physical environment and would have progressed further in the art of building, but the motive for building rectangular rooms—the initial point of departure in the development of pueblo architecture—would not have been brought into action. The crowding of many habitations upon a small cliff ledge or other restricted site, resulting in the rectangular form of rooms, was most likely due to the conditions imposed by this necessity for defense.
The general outlines of the development of this architecture wherein the ancient builders were stimulated to the best use of the exceptional materials about them, both by the difficult conditions of their semi-desert environment and by constant necessity for protection against their neighbors, can be traced in its various stages of growth from the primitive conical lodge to its culmination in the large communal village of many-storied terraced buildings which we find to have been in use at the time of the Spanish discovery, and which still survives in Zuñi, perhaps its most striking modern example. Yet the various steps have resulted from a simple and direct use of the material immediately at hand, while methods gradually improved as frequent experiments taught the builders more fully to utilize local facilities. In all cases the material was derived from the nearest available source, and often variations in the quality of the finished work are due to variations in the quality of the stone near by. The results accomplished attest the patient and persistent industry of the ancient builders, but the work does not display great skill in construction or in preparation of material. The same desert environment that furnished such an abundance of material for the ancient builders, also, from its difficult and inhospitable character and the constant variations in the water supply, compelled the frequent employment of this material. This was an important factor in bringing about the attained degree of advancement in the building art. At the present day constant local changes occur in the water sources of these arid table-lands, while the general character of the climate remains unaltered.
The distinguishing characteristics of Pueblo architecture may be regarded as the product of a defensive motive and of an arid environment that furnished an abundance of suitable building material, and at the same time the climatic conditions that compelled its frequent employment.
The decline of the defensive motive within the last few years has greatly affected the more recent architecture. Even after the long practice of the system has rendered it somewhat fixed, comparative security from attack has caused many of the Pueblo Indians to recognize the inconvenience of dwellings grouped in large clusters on sites difficult of access, while the sources of their subsistence are necessarily sparsely scattered over large areas. This is noticeable in the building of small, detached houses at a distance from the main villages, the greater convenience to crops, flocks and water outweighing the defensive motive. In Cibola particularly, a marked tendency in this direction has shown itself within a score of years; Ojo Caliente, the newest of the farming pueblos, is perhaps the most striking example within the two provinces. The greater security of the pueblos as the country comes more fully into the hands of Americans, has also resulted in the more careless construction in modern examples as compared with the ancient.
There is no doubt that, as time shall go on, the system of building many-storied clusters of rectangular rooms will gradually be abandoned by these people. In the absence of the defensive motive a more convenient system, employing scattered small houses, located near springs and fields, will gradually take its place, thus returning to a mode of building that probably prevailed in the evolution of the pueblo prior to the clustering of many rooms into large defensive villages. [Pl. LXXXIII] illustrates a building of the type described located on the outskirts of Zuñi, across the river from the main pueblo.
The cultural distinctions between the Pueblo Indians and neighboring tribes gradually become less clearly defined as investigation progresses. Mr. Cushing’s study of the Zuñi social, political, and religious systems has clearly established their essential identity in grade of culture with those of other tribes. In many of the arts, too, such as weaving, ceramics, etc., these people in no degree surpass many tribes who build ruder dwellings.
In architecture, though, they have progressed far beyond their neighbors; many of the devices employed attest the essentially primitive character of the art, and demonstrate that the apparent distinction in grade of culture is mainly due to the exceptional condition of the environment.