But, for use in a room so very dimly lighted, the ordinary stage spectacles would have answered quite well.

The second inference is, then, that these spectacles were prepared to be worn under more trying conditions of light--out of doors, for instance.

The third inference is that Weiss was a man with normal eyesight; for otherwise he could have worn real spectacles suited to the state of his vision.
"These are inferences by the way, to which we may return.

But these glasses furnish a much more important suggestion.

On the floor of the bedroom at New Inn I found some fragments of glass which had been trodden on.