92 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 72 



in solid rock, was circular with pedestals for supports of a roof, the 

 beams of which were absent, and had a central fire hole, ventilator, 

 and deflector. It communicated with the tower bv a subterranean 



Fig. 108. — Square Tower House. Photograph by G. L. Beam. Courtesy of 

 the Denver and Rio Grande Railroad. 



passage which bifurcated, one branch opening through the tower floor, 

 the other into a square room situated on the southwest side, also 

 subterranean, partially constructed under a large rock forming a 



