300 SMITHSONIAN MISCELLANEOUS COLLECTIONS t v OL. 50 



The arrangement of the rooms in the northeast building (plate 

 xxvii, a, b, c) is different from that of Casa Grande, 1 but is typical 

 of others, especially the extra-mural clan houses. This similarity 

 would lead one to suspect that this building was not, like the main 

 building, a ceremonial, but rather a residential house. The typical 

 form, to which reference is made, is that of a carpenter's try-square, 

 or that of two sides of a rectangle — a form that reappears in the 

 most southernly situated of the two clan houses on the east and the 

 cluster of rooms in the southwest corner of Compound B. The 

 six ceremonial rooms, together with those extending eastward from 

 the most northern of these along the inner surface of the north wall, 

 make also a group of the same try-square shape. Since one arm of 

 the northeast cluster is formed by the east wall of the compound, 

 it follows that this arm extends approximately east and west, and 

 necessarily the other arm of the try-square lies at right angles, or 

 north and south. 2 



There are five rooms in the east-west arm of the northeast cluster 

 (plate xxiv), two at each end, separated by a single room. All of 

 these rooms have comparatively massive walls, and in most the 

 superficial covering, or plastering, is fairly well preserved. 



Room A, at the west end of the eastern arm of this try-square, 

 had been partially excavated before the Government began work at 

 Casa Grande, but was left in such a bad condition that parts of the 

 east and south walls were practically destroyed. The author re- 

 paired them, filling in the badly eroded holes and walls with adobe 

 bricks and restoring the wall as best he could to its original condi- 

 tion. 



Room B is one of the best-preserved rooms of those excavated. 

 It was opened down to the level of the floor, which was found to be 

 hard and well plastered. Midway through the center of this room, 3 

 at equal distances from east and west walls, there are two holes, a, a, 

 in the floor, in each of which was an erect log, charred by fire, but 



'No building in the compound has the same arrangement of rooms as Casa 

 Grande. It will be instructive to see whether the pyramid of Compound B re- 

 sembles Casa Grande in this particular. 



2 The theory that the historic Casa Grande is composed of two of these try- 

 square-formed buildings, constructed at different times and united, is not 

 wholly evident, nor is it clear that certain rooms, as the northern, have been 

 added to this building since the others were built. 



3 The arrangement of rafters in this roof recalls that of a Pima round 

 house. 



