"This is a nice sunny place for a lizard.

I--" Jo had stepped a little too far.

There was a sudden trembling of the wall.

Jo caught at the adobe, which came away in handfuls, and he fell with a large portion of the old wall.
The next thing he knew, he was lying, choked with dust, on what was once the floor of the old Spanish dwelling.

He was overtopped by a heavy pile of debris, from under which he struggled in vain to extricate himself.