The most picturesque building of Cliff Palace is the round tower, room 36, perched on a high rock overlooking kivas G and H. From it the observer may have a fine view of the entire ruin and the canyon, especially the view down the latter, which is unsurpassed. This tower is not unlike other towers in the San Juan and Mesa Verde regions, one of the most perfect of which is that in Navaho canyon, repeatedly figured. This prominent tower is built of worked stones laid in reddish mortar, and apparently was plastered both inside and outside. It is two stories high, but is without a floor in the upper story, or a roof. The theory in certain quarters that this round tower formerly extended to the roof of the cave is not accepted by the author, who believes that it was formerly only a few feet higher than at present. The break in the upper wall adds much to its picturesque character, which is likewise increased by its association with neighboring buildings. The round tower has a doorway in its lower story, and above is another smaller opening, possibly a window. Several small peepholes are present on the western side. The sides of this structure are symmetrical, its walls slanting gradually inward from the base upward, and its vertical lines curving slightly on the western side. (Pl. 4_a_, 11.) Room 37 is a well-preserved room with a metataki, or grinding bin, in the middle. While rooms 38 and 39 appear to be living rooms, they present no special peculiarities. The northern wall of room 39 was wholly undermined and tottering when the work of repair was commenced, so that its foundations had to be built up from the floor of kiva M. To make this difficult repair work effective it was necessary to enlarge the base of the wall, making the side of kiva M curve slightly inward and thereby insuring a good foundation. [Illustration: PLATE 19 PHOTOGRAPHED BY F. K. VREELAND SOUTHEASTERN WALL OF KIVA Q, BEFORE REPAIRING] The walls of rooms 41 and 42 are well preserved; the top of the cave served as the roof. These rooms were entered from the plaza containing kiva M. In room 42 a stepping-stone is set in the outer wall below the doorway, the object being to facilitate entrance. It is said that this room, the roof of which shows signs of smoke, was occupied by campers while engaged in rifling the ruin of its contents. The cluster of rooms numbered 43 to 45 have well-constructed walls, but they have been considerably mutilated. Pegs from which, no doubt, objects were formerly hung, project from the smoothly plastered interior walls of one of these rooms. Rooms 47 and 48 show the holes of floor joists, so placed as to indicate two stories. These rooms form the southern side of the court, which extends from the main plaza of the settlement to the round rooms at the northern extremity. In front of room 50 there is a low platform from which one steps into the room through an entrance situated about midway of its length.