Facility of defense undoubtedly had something to do with the choice of this location, but that it was not the only desideratum consulted is evident from the occurrence of a large area of fertile bottom land or flat river terrace immediately adjoining the ruin on the east and overlooked by it; in fact, the volcanic dike on which the ruin occurs occupies the western end of a large semicircular area of tillable land, such as already described. Viewed, however, as a village located with reference to defense it is the most perfect example--facility of obtaining water being considered--in this region. It may be used, therefore, to illustrate an important principle governing the location of villages of this type. A study of the ground plan (figure 286) and the general view (plate XXII) will readily show that while the site and character of this village are admirably adapted for defense, so well adapted, in fact, as to suggest that we have here a fortress or purely defensive structure, still this adaptation arises solely from the selection of a site fitted by nature for the purpose, or, in other words, from an accident of environment. There has not been the slightest artificial addition to the natural advantages of the site. The statement may seem broad, but it is none the less true, that, so far as our knowledge extends at the present time, fortresses or other purely defensive structures form a type which is entirely unknown in the pueblo region. The reason is simple; military art, as a distinct art, was developed in a stage of culture higher than that attained by the ancient pueblo builders. It is true that within the limits of the pueblo region structures are found which, from their character and the character of their sites, have been loosely described as fortresses, their describers losing sight of the fact that the adaptability of these structures to defense is the result of nature and not of art. Numerous examples are found where the building of a single short wall would double the defensive value of a site, but in the experience of the writer the ancient builders have seldom made even that slight addition to the natural advantages of the site they occupied. [Illustration: Plate XXV. MAP OF GROUP OF CAVATE LODGES IN WHITE CANYON, 3 MILES BELOW CLEAR CREEK, EAST SIDE RIO VERDE.]