a, From south.
b, From west.
(Photographs by T. G. Lemmon.)]
[Illustration: PL. 11
a, Storage room, Hemlock Canyon, New Mexico.
b, Mushroom Rock without ruin on top, McElmo Canyon, Utah.]
[Illustration: PL. 12
a, Ledge House in cleft of mushroom rock.
(Photograph by Chubbock.)
b, Tower in cedars near Sprucetree House, Mesa Verde National Park.
(Photograph by T. G. Lemmon.)]
[Illustration: PL. 13