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 watch-maker--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 side-bar screw.

The inevitable inference was that this was a spectacle-glass.