Near the center of the room, on the inner wall and about two feet from the floor, was a square of wood firmly embedded in the adobe. This, she thought, might possibly be a means of egress or ingress, so she tested it eagerly, pressing not only upon the wood but on all the blocks of adobe near it, in the endeavor to discover a hidden spring or some other clever mechanical contrivance which would prove the “open sesame.” But the panel and the wall defied all her efforts and she finally concluded it was solid planking placed there to support the wall or to allow cupboards or shelves to be nailed against it.