He continued to hold the paper in the flame. Still it did not
burn.

"See?" he went on, withdrawing it, and starting to explain the
properties of the new fire-proofer.

He had scarcely begun, when he stopped in surprise. He had
happened to glance at the paper again, bent over to examine it
more intently, and was now looking at it in surprise.

I looked also. There, clearly discernible on the paper, was a
small part of what looked like an architect's drawing of a
fireplace.

Craig looked up at me, nonplussed. "Where did you say you got
that?" he asked.

"It was a blank piece of paper among Bennett's effects," I
returned, as mystified as he, pointing at the littered desk at
which I had been working.

Kennedy said nothing, but thrust the paper back again into the
flame. Slowly, the heat of the burner seemed to bring out the
complete drawing of the fireplace.

We looked at it, even more mystified. "What is it, do you
suppose?" I queried.

"I think," he replied slowly, "that it was drawn with sympathetic