The cliff outlooks in Canyon de Chelly and in other regions, the cavate lodges of New Mexico and Arizona, the "watch towers" of the San Juan and of the Zuni country, the summer villages attached to many of the pueblos, the single-room remains found everywhere, even the brush shelters or "kisis" of Tusayan, are all functionally analogous, and all are the outgrowth of certain industrial requirements, which were essentially the same throughout the pueblo country, but whose product was modified by geological and topographical conditions. In the cliff ruins of De Chelly we have an interesting and most instructive example of the influence of a peculiar and sometimes adverse environment on a primitive people, who entered the region with preconceived and, as it were, fully developed ideas of house construction, and who left it before those ideas were brought fully in accord with the environment, but not before they were influenced by it. INDEX [Transcriber's Note: The term "Cliff dwellings" does not occur as an Index entry. The cross-references are probably an error for "Cliff ruins."] Access to cliff Villages 144, 157, 158 Acoma, structural development of 155 Adobe blocks not aboriginal 108 -- construction in pueblo region 163 -- walls in Casa Blanca 108, 109, 111 Age of ruin determined by plastering 121 Agriculture of the Navaho 87 Architecture of cliff ruins 153 --, pueblo, character of 193 --, pueblo, development of 91, 193 Arizona, cliff ruins of Canyon de Chelly 73-198 --, _see_ Cliff dwellings. Army of the West, conquest by 79 Aztecs, cliff ruins attributed to 191