It was impossible to say.
Turning this question over, I suddenly remembered the peculiarity of Mr.
Weiss's spectacles.

And here I met with a real poser.

I had certainly seen through those spectacles as clearly as if they had been plain window-glass; and they had certainly given an inverted reflection of the candle-flame like that thrown from the surface of a concave lens.

Now they obviously could not be both flat and concave; but yet they had the properties peculiar to both flatness and concavity.

And there was a further difficulty.