There might be a flame burning within, or there might be mere vacancy and darkness.

She was pushing back the slide so that she might be sure.
She led him to speak of Egypt upon the last day of his visit.

They were seated upon the hillside, on the edge of a stream which leaped from ledge to ledge down a miniature gorge of rock, and flowed over deep pools between the ledges very swiftly, a torrent of clear black water.
"I travelled once for four days amongst the mirages," he said,--"lagoons, still as a mirror and fringed with misty trees.

You could almost walk your camel up to the knees in them, before the lagoon receded and the sand glared at you.

And one cannot imagine that glare.
Every stone within view dances and shakes like a heliograph; you can see--yes, actually see--the heat flow breast high across the desert swift as this stream here, only pellucid.