Ing there to 6 inches. The northern and southern rooms do not afford as
good bases for comparison, as a corner is missing in each; but
measurements to a point where the interior wall surfaces would intersect
if prolonged, show variations of from 6 inches to a foot. The statement
that the ruin exhibits exceptional skill in construction on the part of
the builders, is not, therefore, supported by facts. _Detailed
Description._ The Casa Grande ruin is often referred to as an adobe
structure. Adobe construction, if we limit the word to its proper
meaning, consists of the use of molded brick, dried in the sun but not
baked. Adobe, as thus defined, is very largely used throughout the
southwest, more than nine out of ten houses erected by the Mexican
population and many of those erected by the Pueblo Indians being so
constructed; but, in the experience of the writer, it is never found in
the old
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