“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. By joining one or two of them together, we have been able to make out the general character of the object of which they formed parts. My assistant⁠—who was formerly a watchmaker⁠—judged that object to be the thin crystal glass of a lady’s watch, and this, I think, was Jervis’s opinion. But the small part which remains of the original edge furnishes proof in two respects that this was not a watch-glass. In the first place, on taking a careful tracing of this piece of the edge, I found that its curve was part of an ellipse; but watch-glasses, nowadays, are invariably circular. In the second place, watch-glasses are ground on the edge to a single bevel to snap into the bezel or frame; but the edge of this object was ground to a double bevel, like the edge of a spectacle-glass, which fits into a groove in the frame and is held by the sidebar screw. The inevitable inference was that this was a spectacle-glass. But, if so, it was part of a pair of spectacles identical in properties with those worn by Mr. Weiss.