If I could see objects unaltered through them, so could Mr.Weiss.But the function of spectacles is to alter the appearances of objects, by magnification, reduction or compensating distortion.

If they leave the appearances unchanged they are useless.

I could make nothing of it.

After puzzling over it for quite a long time, I had to give it up; which I did the less unwillingly inasmuch as the construction of Mr.Weiss's spectacles had no apparent bearing on the case.
On arriving home, I looked anxiously at the message-book, and was relieved to find that there were no further visits to be made.

Having made up a mixture for Mr.Graves and handed it to the coachman, I raked the ashes of the surgery fire together and sat down to smoke a final pipe while I reflected once more on the singular and suspicious case in which I had become involved.