“The importance of this conclusion emerges when we consider the exceptional character of Mr. Weiss’s spectacles. They were not merely peculiar or remarkable; they were probably unique. It is exceedingly likely that there is not in the entire world another similar pair of spectacles. Whence the finding of these fragments of glass in the bedroom establishes a considerable probability that Mr. Weiss was, at some time, in the chambers at New Inn.

“And now let us gather up the threads of this part of the argument. We are inquiring into the identity of the man Weiss. Who was he?

“In the first place, we find him committing a secret crime from which John Blackmore alone will benefit. This suggests the prima facie probability that he was John Blackmore.