For here we had come upon the crucial fact to which, as I have said, all sound inductive reasoning brings one sooner or later.
"The spectacles were of a rather peculiar pattern.

The frames were of the type invented by Mr.Stopford of Moorfields and known by his name.
The right eye-piece was fitted with plain glass, as is usual in the case of a blind, or useless, eye.

It was very much shattered, but its character was obvious.

The glass of the left eye was much thicker and fortunately less damaged, so that I was able accurately to test its refraction.
"When I reached home, I laid the pieces of the spectacles together, measured the frames very carefully, tested the left eye-glass, and wrote down a full description such as would have been given by the surgeon to the spectacle-maker.

Here it is, and I will ask you to note it carefully.
"'Spectacles for constant use.